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Chain Rule - General Aptitude

Q1:

An industrial loom weaves 0.128 metres of cloth every second. Approximately, how many seconds will it take for the loom to weave 25 metres of cloth?

A 178

B 195

C 204

D 488

ANS:B - 195

Le the required time be x seconds. More metres, More time (Direct Proportion)  0.128 : 25 :: 1 : x        0.128x = 25 x 1

x = 25 = 25 x 1000
0.128 128
 x = 195.31.  Required time = 195 sec (approximately).