Can someone help me with this?

Question

asked Jul 20, 2022 171k views

2 Answers

Andrew Kennan · Answer 1 · 2022-07-21T11:35:08+0000

Let n = number of gum packs he buys.

After he starts with 30, spends 12, then spends 4n, he must have at least 0 remaining. So:

$30-12-4n\geq 0$

Simplify by subtracting 30-12:

$18-4n\geq 0$

Subtract 18 from both sides:

$-4n\geq -18$

Divide both sides by -4 (flip the sign when you multiply or divide by a negative):

$n\leq 4.5$

You can only buy a whole number of gum packs, so:

$n\leq 4$

Preston can buy up to 4 gum packs, assuming his money isn't stollen my monke