self Maths Puzzle

A certain work can be completed in 15 days by 12 men, 18 women and 24 boys respectively. How long would 3 men, 9 women and 18 boys have to work together to do it ?

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self Other Question

Find the least number which when divided by 25,40,60 leaves 7 as remainder in eash case. The result of a school is as follows:
1st division 7%, 2nd division 15%, 3rd division 50%. If 98 students were failed then find the total number of students appeared from the school.