In the science class,
there are 3 girls and 1 boy (grade 7)
and 5 girls and 5 boys (grade 8)
There is a total of 14 pupils being 8 girls and 6 boys
The probability of choosing a boy will be

Which can be simplified into

by
dividing 2 from the numerator as well as the denominator.
Answer:
60° and 120° are supplementary angles. 93° and 87° are supplementary angles.
They are supplementary angles because they form an 180º angle together.