4 mat-weavers can weave 4 mats in 4 days. At the same rate, how many mats would be woven by 8 mat-weavers in 8 days?
Choose the most appropriate option
A) 4  B) 16  C) 8  D) 1  E) 2

Rationale: explanation : let the required number of mats be x more mat - weavers , more mats ( direct proportion ) more days , more mats ( direct proportion ) hence we can write as ( mat - weavers ) 4 : 8 ( days ) 4 : 8 } : : 4 : x ⇒ 4 × 4 × x = 8 × 8 × 4 ⇒ x = 2 × 2 × 4 = 16 answer : option b
Answer: B