General Maths Puzzle Logical Reasoning

we hv rs 100,we should buy 100 things at rs.5,rs 0.75paise,rs 0.25paise,how can we buy?

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General Other Question

2,1=9
4,2=18
5,3=18
6,3=27
then
9,4=? from a total of 15 people, 3 committees of 3, 4, and 5 people respectively are to be chosen. how many such sets of committees are possible if no person may serve on more than one committee?