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When Mary was born, she weight 8 pounds. When she was 10, she weighed 10 times as much. Write and solve an equation to find the difference between Mary's weight when she was 10 and when she was born.

User KDP
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1 Answer

7 votes

Answer:

Δw =
W_(b) * 10 -
W_(b) = 72 pounds

Explanation:

Using the names


W_(b)
: weight when born


W_(10)
:weight when she was then

Δw: weight difference

the equation would be

Δw =
W_(10) -
W_(b)

since


W_(10) =
W_(b) * 10

we can replace and we have that

Δw =
W_(b) * 10 -
W_(b)

and since


W_(b) = 8

Δw = 8 * 10 - 8 = 72

User Fifi
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