7.
A can do a piece of work in 10 days while B can do it in 15 days. They begin together but
5 da
before the completion of the work, B leaves off. The total number of days for the work to complet
days.
in
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Explanation:
Work per day
A= 1/10
B= 1/15
(1/10)×x + (1/15)(x-5)= 1
(x/10)+ (x-5)/15=1
[3x+2(x-5)]/30= 1
3x+2x-10=30
5x= 40
x= 40/5= 8
total number of days= 8 days
where A worked for full 8 days
and B worked for 8-5= 3 days
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