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given the average income of 7men,11 women and 2 boys is 257.5 let the amount of men be M women be W and boys be B so 7M+11W+2B/7+11+2=257.5 so 7M+11W+2B=20*257.5 7M+11W+2B=5150 given that avg daily income of men =10+W----1 W=10+B-----2 M+20+B------3 we need to find the average income of men so convert equation 1,2,3 in form subjective to M so, now the average is 7M+11(M-10)+2(M-20)/20 7M+11M+-110+2M-40=5150 20M-150=5150 20M=5300 M=265
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