A class has 158 students.
We are given 1/11 girls and 1/7 boys.
lets say a is girls and
b are boys .
Then we have 11a+7b =158
or 7b = (158-11a)
b = (158-11a)/7 = (158-4a)/7-a
When a=8, (158-32) =126
Hence a=8 , b = (158-32)/7-a =18-8=10
Thus we have 11a =11*8 = 88 girls and 7b =7*10 =70boys
Answer: 88 girls and 70 boys
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