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y-liczba chłopców
x+y=150
1/3 x+2/7 y=46
x=150-y
1/3 *(150-y)+2/7y=46
x=150-y
50-1/3 y+2/7 y=46 /*21
x=150-y
1050-7y+6y=966
x=150-y
1050-y=966
y= -84
x=150+84
y=84
x=66
y=84
ODp: Test pisało 84 chłopców i 66 dziewczyn.