Delvin, Eric and Felicia have 478 stickers. Delvin has 4 times as many stickers as Eric. Felicia has 397 stickers more than Delvin. How many stickers does Delvin have?
478 stickers,
4x -> Delvin
397 + 4x -> Felicia
x -> Eric
478 = 4x + 397 + 4x + x
478 = 9x + 397
478 - 397 = 9x
81/9 = 9x/9
9 = x
Delvin = 4x
= 4(9)
= 36
36 stickers
