Kenny had 230 marbles and Ditor had 65 marbles. When each one gave away the same number of stickers, Kenny then had 4 times as many stickers as Ditor. How many marbles did each give away?
230 - x 4
_______ = ___ cross-multiply
65 - x 1
230 - x = 4 (65 - x)
230 - x = 260 - 4x
4x - x = 260 - 230
3x = 30
x = 30 /3 = 10 = number each gave away
+129 
