book Maths Puzzle Numerical Ability

a group of 80 people attended a ball game. There were three times as many children as adults in the group. How many children were in the group?

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book Other Question

can you help me with thequation, formula, & inequality
1) y/9=7

2) y/9+5=0

3) Given the formula K=LMN, what is the formula for M?

4) 3p-16<20.
what does "x" equal?

(x+1)(x-3)=4


What does "x" equal?

x(x-2)= -6