A gross refers to a group of 144 items (a dozen dozen or a square dozen).
144 + 144 = 288
288 + 144 = 432
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Oh, dude, if you bought 3 gross of pencils, you would have 432 pencils. Yeah, that's right, a gross is 144 pencils, so just multiply 144 by 3 and boom, you've got yourself a whole lot of pencils. Like, who even needs that many pencils, am I right?
432 = 3 x (12 x 12) = 3 x 144 = 3 gross
$25.60
3 pencils for 1.65 implies that pencils are 1.65/3 = 0.55 each. Then 7 are 7*0.55 = 3.85
The total number of rolls, R, is R = 5p + 3