The sum of one-fifth of a number and 3 7/10 is 7. Find the number.
1. The sum of one-fifth of a number and 3 7/10 is 7. Find the number.
Penjelasan dengan langkah-langkah:
penjumlahan 3 7/10
37/10=3,7
angkanya yang kurang adalah 3
2. The sum of 40 % of number A and 30 % of number B is 6. The sum of 25 % of number A and 15% of number B is 5. Accordingly, what is the value of A?
40%A+30%B=6
----------------------- x 100
40A+30B=600
4A,+3B=60
25%A+15%B=5
---------------------- x 100
25A+15B=500
5A+3B=100
4A+3B= 60
------------------ -
A = 40
3. the sum of 3 even number is 90 the sum of the biggest and the smallest number is
Jawaban:
jumlah dari 3 bilangan genap adalah 90 hasil penjumlahan dari bilangan terbesar dan terkecil
4. There are five positive numbers. The sum of the first and the fifth number is 15. the second number is ⅓ of the sum of these five numbers, the third number is ¼ of this sum and the fourth number is 1/5 of this sum. What is the value of the largest number? (Pakai cara)
example : the five positive numbers are a, b, c, d, and e,, the sum = x
a + e = 15
b = 1/3 x
c = 1/4 x
d = 1/5 x
otomatis a = 1/2 x dan e = 1/6 x
1/2 x + 1/6 x = 4/6 x = 2/3 x
a + e = 15
2/3 x = 15
x = 15 : 2/3
= 45/2
the value of the largest number is
a = 1/2 x = 1/2 ( 45/2 ) = 45
=>> 45
maaf kl salah
5. the sum of 2 number is 32. of the first number is 10,then the difference between both numbers is
Penjelasan dengan langkah-langkah:
x + y = 32
10 + y = 32
y = 32 - 10
y = 22
so the difference between both number is 22
6. The sum of a number and twice the square of the number is 45. Find the number.
Penjelasan dengan langkah-langkah:
let the number = n
=>n+2n²=45
2n²+n-45=0
(2n-9)(n+5)=0
n=9/2orn=-5
goodluck
7. the sum of number and 6 is 31. Find the number
31 - 6 = 25
Jawabannya adalah 25
25 + 6 = 31
Maaf kalau salah
8. the sum of four number is 211 the average of three of the number is 42. what is the four number ?
Pelajaran:Matematika
Arti pertanyaan tersebut dalam Bahasa Indonesia:
Jumlah dari 4 bilangan adalah 211 dan rata-rata 3 bilangan adalah 42.Berapakah nilai dari bilangan ke-4 tersebut.
Jawab:
Misal:
Bilangan 1=A
Bilangan 2=B
Bilangan 3=C
Bilangan 4=D
A+B+C+D=211
42=A+B+C÷3
A+B+C=42×3
A+B+C=126
Nilai bilangan keempat(D)=211-126=85.
Semoga membantu.>_<.Jadikan jawaban terbaik ya.
a+b+c+d = 211
(a+b+c)/3 = 42
a+b+c = 126
a+b+c+d = 211 <= a+b+c = 126
126+d =211
d = 85
9. The sum of two numbers is 63. The ratio of the two numbers is 4:5. Find the first number and the second number!
• first number :
4 / (4 + 5) x 63 = 28
• second number :
5 / (4 + 5) x 63 = 45
10. The sum of a number and 78 is 92 . What is the number?
Jawaban:
x + 78 = 92
x = 92 - 78
x = 14
semoga membantuu
Jawab:x + 78 = 92
x = 92 - 78
x = 14
Penjelasan dengan langkah-langkah:maaf jika salah
jadikan jawaban yang terbaik ya
11. The sum of the two numbers is 4 the difference between the two number is 44 find the number (......and.....)
Jawaban:
24 and (-20)
Penjelasan dengan langkah-langkah:
a+b=4
a-b=44
----------- +
2a=48
a=24
a+b=4
24+b=4
b=-20
12. a) 50% of a number is 6. What is the number?b) 5% of a sum of money is $7. How much is the sum of money?c) 7% of an amount of water is 56 ml. What is the amount of water? d) 80% of the number of pupils in a class is 24. How many pupils are there in the class?
[tex]a). \frac{100}{50} \times 6 = 12 \\ \\ b). \frac{100}{5} \times 7 = 140 \\ \\ c). \frac{100}{7} \times 56 = 800 \\ \\ d). \frac{100}{80} \times 24 = 30[/tex]
13. The sum of two numbers is 20 and the sum of their squares is 272. Find the firstnumber
Jawab:
4 or 16
Penjelasan dengan langkah-langkah:
Let the numbers be x and y
x + y = 20
sum of their squares is 272 so x^2 + y^2 = 272
Find the first number,
We know that x^2 + y^2 = (x + y)^2 - 2xy
so 272 = 20^2 - 2xy
272 = 400 - 2xy
2xy = 128
xy = 64
We know that x + y = 20 and xy = 64, so we can make quadratic equation,
let a1 = x and a2 = y
a^2 - 20a + 64 = 0
(a - 16)(a - 4) = 0
a = 16 or a = 4
So the first number can be 4 or 16
If the first number less than the second, the answer is 4
Semoga terbantu :)
IG: @djie.jemmy
Jawab:
4 or 16Penjelasan dengan langkah-langkah:
If the first number is [tex]x[/tex] and the second one is [tex]y[/tex],
we can write:
[tex]x + y = 20[/tex]
[tex]x^{2} + y^{2} = 272[/tex]
Then
[tex]x = 20 - y[/tex]
Substitute [tex]x = 20 - y[/tex] to [tex]x^{2} + y^{2} = 272[/tex]
[tex](20 - y)^{2} + y^{2} = 272[/tex]
[tex]400 - 40y + y^{2} + y^{2} = 272[/tex]
[tex]2y^{2} - 20y + 128 = 0[/tex]
Factorize the equation and we get:
[tex](y-16)(y-4) = 0[/tex]
[tex]y = 16[/tex] ∨[tex]y = 4[/tex]
If we substitute [tex]y = 16[/tex] to [tex]x = 20 - y[/tex], we get [tex]x = 4[/tex]
So, we can conclude that both numbers are 4 and 16.
14. the sum of three times a number and 11 is 32 .write the expression
Jawaban:
3x + 11 = 32
Penjelasan:
Three times a number = 3 kali suatu bilangan
Jadi the sum of three times a number and 11 is 32 bentuknya yaitu 3x + 11 = 32
15. The sum of half of a number and 49 is 2¼ of the numbers. Find the number.
Jawab:
28
Penjelasan dengan langkah-langkah:
Ini kita bikin persamaan matematikanya dulu, ya. Baru dicari =
1/2x + 49 = 2 1/4x
1/2x + 49 = 9/4x (dikali 4)
2x + 196 = 9x
196 = 9x - 2x
196 = 7x
28 = x
Semoga membantu, yaa.
16. the difference of two positive number is 3, and the sum of their square is 117. determine the two number
4 - 1 = 3
5 - 2 = 3
6 - 3 = 3
7 - 4 = 3
8 - 5 = 3
9 - 6 = 3
...
Find the sum of the square with the result 117
16 + 1 ≠ 117
25 + 4 ≠ 117
36 + 9 ≠ 117
49 + 16 ≠ 117
64 + 25 ≠ 117
81 + 36 = 117
The two numbers are 9 and 6
17. the sum of half of a number and 49 is 2 ¼ if the numbers .find the number
Jawab:
Penjelasan dengan langkah-langkah:
18. I have a three-digit number, and I add its digits to create its digit sum. When the digit sum of my number is subtracted from my number, the result is the square of the digit sum. What is my three-digit number?
Jawaban:
jabawannnya gc salin jawabnnya
19. (a)find all the 2-digit prime numbers whose sum of the digits is divisible by 7b) lucy is thinking of a prime number.it is less than 30.the sum of its digits is 11.what number is lucy thinking of?
Jawab:
(a) 43, 59, 61
(b) 29
Penjelasan dengan langkah-langkah:
semoga membantu
(kok sama kayak di buku ku)
20. The sum of 2 numbers is 112and theirdifference is 54Find the 2 number
Penjelasan dengan langkah-langkah:
ex
2 number = x and y
[tex]x + y = 112 \\ x - y = 54[/tex]
_____________-
[tex]2y = 58 \\ y = \frac{58}{2} = 29[/tex]
[tex]x + y = 112 \\ x = 112 - y \\ x = 112 - 29 = 83[/tex]
so the 2 number = 29 and 83
Jawab:
a=83 b =29
Penjelasan dengan langkah-
misal Bilangan a dana b
mana a+b=112
dan a-b=54
so,we can determine a or b using elemination or subs
ill use subs methode
a+b=112
a=112-b
so ,a-b=54
112-b-b=54
-2b=-58
b=29
then using value of B we can determine the value of A
a+b=112
a+29=112
a=83
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