Posted by Brooke on Wednesday, November 7, 2012 at 10:18pm.
T total cookies
T-(Tx1/4) - ((T-(Tx1/4))x1/2) =18
T-T/4 - 3T/4 x 1/2= 18
3T/4-3T/8=18
3T/8=18
3T=144
T=48
or,
after giving (1/4)T away, she has (3/4)T left
after giving 1/2 of those away, she has (1/2)(3/4)T or (3/8)T left
3T/8 = 18
3T = 144
T = 48
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