Question

TWO FRIENDS A AND B CAN DO WORK IN 12 DAYS AND 8 DAYS RESPECTIVELY. FIND THE AMOUNT OF WORK DONE BY THEM IN 4 DAYS.

a. 1/6th b. 5/6th c. 3/4th d. 1/4

Answer 1

Hi,

Explanation:

A can do the work W in 12 day, his speed is W/12 per day

B can do the work W in 8 day, his speed is W/8 per day

A and B in 4 day can do 4*(W/12+W/8)=4*(2W+3W)/24=4*5W/24=5/6*W

Answer B: 5/6 th