If x and y are directly proportional, and x = 8 when y = 2, what is the value of x when y = 10?
Q1. If x and y are directly proportional, and x = 8 when y = 2, what is the value of x when y = 10?
Answer: 40
Explanation: Direct proportion means x/y is constant; k = 8/2 = 4, so when y = 10, x = 4 × 10 = 40.