15 girls can dig a pit in 420 days. If a boy is twice as efficient as a girl, then 5 girls and 5 boys can dig a similar pit in how many days?
15 girls complete work in 420 days
1 girl's work = 1 / (15 × 420)
A boy is twice as efficient as a girl
1 boy = 2 girls
5 boys = 10 girls
Total workers = 5 girls + 10 girls
= 15 girls
Since total efficiency same as 15 girls
Time required = 420 days
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