Question

If Ned can buy 8 copies of a certain book for $28, how much would it cost him to buy 15 copies at the same rate?

$52.50

$50.50

$51.75

$42.50

Answer 1

\[\large \frac{ $28 }{ 8 } = \frac{ x }{ 15 }\]
\[\large 28(15) = 8x\]
Solve for \(\large x \).

Answer 2

but... what's x?