Question

Explain how to undo pemdas with this equation and find answer

Answer 1

Given that Sarah spent half of her weekly allowance.

She earns $4.70 for washing dogs.

The final amount is $ 13.50.

Let x be the weekly allowance.

She spent half of her allowance so she has half of the allowance.

`(x)/(2)`

She earns $ 4.70, add this to her half of the allowance.

`(x)/(2)+4.70`

This is equal to 13.50.

`(x)/(2)+4.70=13.50`

Subtracting 4.70 from both sides, we get

`(x)/(2)+4.70-4.70=13.50-4.70`

`(x)/(2)=8.80`

Multiplying 2 on both sides, we get

`(x)/(2)*2=8.80*2`
`x=17.60`

Hence Sarah's weekly allowance is $ 17.60.