Question

Is my answer correct

Answer 1

You are correct.

Explanation:

`13 * 3 = 9`

Child B completed
`x`

Child A =
`5x`

Child C =
`x + 4`

`x + 5x + x + 4 = 39`

`7x = 35`

`x = 5`

Child A =
`5 * 5 = 25`

Answer 2

Yes, you are correct.

Explanation:

`\text{Let the number of puzzle solved by Child B is} x\text{.}`

`\text{Then the average number of puzzle solved is}`

`(5x+x+(x+4))/(3)=13`

`(7x+4)/(3)=13`

`7x+4=39`

`7x=35`

`x=5`

`\text{Therefore, the number of puzzles solved by child A is }5x=5\cdot5=25`

`\color{blue}\text{A little tips here: You can check it by substituting your answer to the original equation.}`