A does a work in 20 days and b doesthe same in 25 days the work together for5 days and then a left . so in what timewill b finish the rest of the work
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this problem we solve by lcm method
lcm of 20 and 25 is total work
lcm = 100 unit work
they separate do
100/20 = 5 unit / days
100/25 = 4 unit / days
together = 5 + 4 = 9 unit
they together do 5 days
9 × 5 = 45 unit work done
then A left
remaining work is
100 - 45 = 55 unit
B do this in
55/4 = 13.75 days
lcm of 20 and 25 is total work
lcm = 100 unit work
they separate do
100/20 = 5 unit / days
100/25 = 4 unit / days
together = 5 + 4 = 9 unit
they together do 5 days
9 × 5 = 45 unit work done
then A left
remaining work is
100 - 45 = 55 unit
B do this in
55/4 = 13.75 days
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