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100 people took part in the math contest.
The ratio of male to female students is:

(70-63):(63-60)=7:3

Male: 100÷(7+3)×7=70.

Female student: 100-70=30.

Equation:

Solution: Suppose there are x boys and 100-x girls.

Equivalence relationship: total score of boys+total score of girls = total score of the whole school.

60x+70( 100-x)= 100×63

60x+7000-70x=6300

10x=700

x=70

100-70=30 people

A: There are 70 boys and 30 girls.