5 2/5

5 2/5 hours a week  mathematics,  3 3/4 hours a week   Natural sciences, 4 3/8 hours a week  Technology . how many hours does  he spend on social sciences if he spend 17 1/2 hours a week for the four subject?

Correct answer:

S =  3.975 h

Step-by-step explanation:

M=525=5+25=5 5+25=275=5.4 h N=334=3+34=3 4+34=154=3.75 h T=438=4+38=4 8+38=358=4.375 h  x=1712=17+12=17 2+12=352=17.5 h  x=S+M+N+T  S=xMNT= h=33940 h=3.975 h

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