Question

two number are in the ratio 5:7 if the sum of the number 720 find the number

Answer 1

let one number be 5x
then second number is 7x
5x+7x=720
12x=720
x=720/12
x=60

first number =5x=5×60=300
second number=7x=7×60=420

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Answer 2

Let the numbers in ratio be 5x and 7x

Given, their sum = 720


According to the question,

5x + 7x = 720

12x = 720

x = $\dfrac{720}{12}$

x = 60


Now, we got the value of x. Now let's multiply them to get numbers.


1st number => 5x => 5 × 60 => 300

2nd number => 7x => 7 × 60 => 420