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Chain Rule - General Aptitude

Q1:

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?

A 4

B 8

C 12

D 16

ANS:D - 16

Let the required number of bottles be x. More weavers, More mats (Direct Proportion) More days, More mats (Direct Proportion)

Wavers 4 : 8 :: 4 : x
Days 4 : 8
 4 x 4 x x = 8 x 8 x 4
 x = (8 x 8 x 4)
(4 x 4)
 x = 16.