Posted by Brooke on Wednesday, November 7, 2012 at 10:18pm.
Jill made some cookies. Jill gave 1/4 of her cookies to Bob. Then Jill gave 1/2 of the remaining cookies to Joe. At this point, Jill had 18 cookies left. How many cookies did Jill have at first?

Math  Many, Wednesday, November 7, 2012 at 10:23pm
T total cookies
T(Tx1/4)  ((T(Tx1/4))x1/2) =18
TT/4  3T/4 x 1/2= 18
3T/43T/8=18
3T/8=18
3T=144
T=48

Math  Reiny, Wednesday, November 7, 2012 at 10:27pm
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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