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?
Let the required number of mats be x.
Clearly, if number of weavers are increase then number of mats also increase.
So, the given situation is in Direct Proportion.
Similarly, More days, More mats (Direct Proportion)
Weavers4:8Days4:8}::4:x
∴4×4×x=8×8×4
⇒x=(8×8×4)(4×4)
⇒x=16
Hence, Option B is correct.