@rowdy-rathore by taking lcm of 14 and 21 we get -
3 units done by a and 2 units done by b
last 3 days b did 3*2= 6 units of work.
a nd b did 42-6=36 units of work together.
so 36/5=7.2 days by both
total days =7.2+3=10.2 days.
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