Question

20 students of class X took part in mathematics quiz. If the number of girls exceed
number of boys by 8, find the number of boys and girls who took part in quiz.
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Answer 1

You should have to assume x for girls and x-8 for boys.
Then add x+x-8=20, solve it

Answer 2

Answer: let th no. Of boys participant be X

Then

For girls it will be

X+8

Now it given that

X+X+8=20

2X+8=20

2X=12

X=6

then no. Of girls participated = 6+8 = 14