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 spends 17 1/2 hours a week on the four subjects?

Correct answer:

S =  3 3940 = 159/40 h

Step-by-step explanation:

M=552=5+52=55 5+2=525+2=527=5.4 h N=343=3+43=43 4+3=412+3=415=3.75 h T=483=4+83=84 8+3=832+3=835=4.375 h  x=1721=17+21=217 2+1=234+1=235=17.5 h  x = S+M+N+T  S=xMNT=235527415835=40700402164015040175=40700216150175=40159=40159 h=34039 h=3.975 h

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