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1 . If $5\over4$ part of a work is done by 12 men in 15 days, how many men will be require to complete the whole work in 25 days?
[ A ]    10 men
[ B ]    12 men
[ C ]    9 men right
[ D ]    11 men
Answer : Option C
Explanation :
In 15 days $5\over4$ work is done by 12 men
∴ 1 day work is done by 12× 15 × $5\over4$
∴ In 25 days 1 work is done by = $3 15 5\over25$ = 9 men
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