Two numbers x and y are in the ratio 5 : 7 and their sum is 36. What is the value of x.
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 15
Numbers in the ratio 5 : 7 can be written as \(5k\) and \(7k\), so their sum is made of \(5+7=12\) equal parts.
The sum is 12 parts: \(12k=36\), so one part \(k=3\)
x is 5 parts: \(x=5\times3=15\)