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And show your work please

And show your work please-example-1

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Mia: s + 5

Raul: 3(s + 5)

Sofia: s

Make an equation where all of their stamps add up to 100.

s + 5 + 3(s + 5) + s = 100

Distribute 3 inside the parentheses.

s + 5 + 3s + 15 + s = 100

Combine like terms.

5s + 20 = 100

Subtract 20 from both sides.

5s = 80

Divide both sides by 5.

s = 16

Plug in s into their equations.

Mia: s + 5 ⇒ 16 + 5 = 21

Raul: 3(s + 5) ⇒ 3(16 + 5) = 63

Sofia: s ⇒ 16

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