4 mat-weavers can weave 4 mats in 4 days. At the same rate, how many mats would be woven by 12 mat-weavers in 12 days?
Choose the correct choice from the following:
A) 25	B) 19	C) 39	D) 61	E) 36

Rationale: "let the required number of bottles be x . more weavers , more mats ( direct proportion ) more days , more mats ( direct proportion ) wavers 4 : 12 : : 4 : x days 4 : 12 4 * 4 * x = 12 * 12 * 4 x = ( 12 * 12 * 4 ) / ( 4 x 4 ) x = 36 . answer is e ."
Answer: E