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15 men can complete a work in 10 days while 20 boys can complete the same work in 15 days. how many days will 10 men and 10 boys together take to complete the same work?
8 days
10 days
12 days
15 days
15 men --------- 10 days
1 man --------- 150 days
10 men --------- 15 days
20 boys --------- 15 days
1 boy --------- 300 days
10 boys --------- 30 days now 10 men takes 15 days
so in one day they complete 1/15 of work
10 boys takes 30 days
so in one day they complete 1/30 of work
both together completes the work in one day = 1/15 + 1/30
= 45 / 15 ×30 = 1/10 of work
so together they fulfil the work in 10 days
Hence, option 2 is the correct answer.
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