Question

problema 54 va rog frumos

Answer 1

$a+b+c=130 \\ \\ a- \frac{2a}{3} =b- \frac{75b}{100} =c- \frac{40c}{100} \\ \\ b= \frac{100a}{75} = \frac{4a}{3} \\ \\ c= \frac{100a}{180} = \frac{5a}{9} \\ \\ a+ \frac{4a}{3} + \frac{5a}{9} =130.amplificam \\ \\ 9a+12a+5a=1170 \\ 26a=1170=\ \textgreater \ a=1170:26 \\ \\ a=45 lei \\ \\ b= \frac{4*45}{3} =60 lei \\ \\ c= \frac{5*45}{9} =25 lei$

2/3din45=30 lei a cheltuit primul
75/100 din 60=45 lei a cheltuit al2lea
40/100 din 25=10 lei a cheltuit al3lea

Answer 2

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