50 Labourers Can Dig Pond In 16 Days

50 labourers can dig a pond in 16 days. How many labourers will be required to dig an another pond, double in size in 20 days ?

Answers:

In 16 days for digging a pond labour reqd. = 50

In 1 day, labour reqd. = 50 × 16

In 20 days, labour reqd. = (50 × 16)/20

In 20 days with double work, labour reqd.

= (50 × 16 × 2)/20 = 5 × 8 × 2 = 80

Hence labourers required = 80