A constructor estimates that 3 people can paint Mr khans house in 4 days. If he uses 4 people instead of 3,how long will they take to complete the job? Choices:
A) 2
B) 8
C) 1
D) 3
E) 4

Rationale: explanation : use formula for a work members × days = constant 3 × 4 = 4 × a a = 3 so answer is 3 days answer : d
Answer: D