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Re: 3 men and 4 boys can earn $756 in 7 days. 11 men and 13 boys can earn
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05 Apr 2019, 01:03
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In 7 days, 3 men+4 boys (Combo 1) can earn $756 In 1 day, 3M+4B (C1) can earn $108 (756/7)
In 8 days, 11M+13B (Combo 2), can earn$3008 In 1 day, 11M+13B, can earn $376 (3008/8)
By increasing C1 eleven-fold and C2 three-fold, we see that in 1 day: 33M+44B (C3) can earn $1188 (108*11) and 33M+39B (C4) can earn $1128 (376*3) The presence of 5 more boys in C3 (the number of men being the same in both combos) yields an additional income of $60 (1188-1128) in 1 day from which we can conclude that 1 boy can earn $12 in a day. From the fact that 3M+4B can earn $108 in 1 day, we can calculate that 1M earns $20 in 1 day.
Let's say X is the number of days it takes 7M & 9B to earn $2480. Then, $20*7X+ $12*9=$2480 -----> 248X=2480 ----> X=10 days. Ans:B
gmatclubot
Re: 3 men and 4 boys can earn $756 in 7 days. 11 men and 13 boys can earn
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05 Apr 2019, 01:03
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64% (02:50) correct 
