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?  Choices:  A) 4  B) 16  C) 8  D) 1  E) 2
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 16
<result>B</result>
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?