P can do a piece of work. in 20 days and Q in 40 days. P begins the work and thereafter they work alternately on one on each day. On which day will the work be completed?
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let total work =lcm of a &b=lcm of 20 &40=40
P ka 1 din ka kam=40/20=2 units
Q ka 1 din ka kam=40/40=1 units
2 days work of both=2+1=3 units
2×13days=3×13work unit
26 days=39 units
now on 27 th days ,P work
1 unit in 1/2 days
so total days 26½ days
P ka 1 din ka kam=40/20=2 units
Q ka 1 din ka kam=40/40=1 units
2 days work of both=2+1=3 units
2×13days=3×13work unit
26 days=39 units
now on 27 th days ,P work
1 unit in 1/2 days
so total days 26½ days
rahul682632:
why multiply by 13
and the answare is 27
for equalising both sides
27 ans isliye h kyonki ye pucha gya h kis din work complete hoga
to work complete 27 ve din ho raha h
aur 13 se multiply isliye kiya h taki total work 40 h uske pass phuxh sake
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