Question

I need help with math

Answer 1

we have:

total cards = 40

New York Yankees cards = 10

Chicago Cubs cards = x

Boston Red Sox cards = y

`\begin{gathered} 10+x+y=40 \\ \end{gathered}`

then x = y, therefore:

`\begin{gathered} 10+y+y=40 \\ 10+2y=40 \\ 10+2y-10=40-10 \\ 2y=30 \\ (2y)/(2)=(30)/(2) \\ y=15 \end{gathered}`

so, x = y = 15

answer:

Bill has 10 New York Yankees cards, 15 Chicago Cubs cards and 15 Boston Red Sox cards