Question

2/5 of the people at the park are boys, and 1/10 are adults. there are also 15 girls at the park. How many people are at the park.

Answer 1

we can write an equation to solve, I will use the unknow X to represent people at the park

`(2)/(5)x+(1)/(10)x+15=x`

where x is total people at the park

to solve, group values with x

`\begin{gathered} (2)/(5)x+(1)/(10)x-x=-15 \\ \\ ((2)/(5)+(1)/(10)-1)x=-15 \end{gathered}`

simplify

`\begin{gathered} -(1)/(2)x=-15 \\ \\ (1)/(2)x=15 \\ \\ x=15*2 \\ x=30 \end{gathered}`

total people at park are 30