If x is directly proportional to y and x = 10 when y = 8, then what is the value of x when y = 36?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 45.
Calculations:
y ∝ x
y = kx [where k = constant]
When, y = 8, x = 10
⇒ 8 = 10k
⇒ k = 4/5
When, y = 36
⇒ 36 = 4x/5
⇒ x = 180/4 = 45