Posted by Evelyn on Thursday, December 9, 2010 at 8:37pm.
Andy had 20% fewer marbles than Henry. When Andy gave 80 marbles to Henry, the numbers of marbles he had left was half of what Henry had. How many marbles did Andy have in the begining?
Please help me

math  Reiny, Thursday, December 9, 2010 at 9:31pm
at start:
Henry  x marbles
Andy  .8x marbles
after giveaway:
Henry  x+80
Andy  .8x  80
Andy's marbles = 1/2 of Henry's marbles
.8x80 = (1/2)(x+80)
times 2
1.6x  160 = x+80
.6x = 240
x = 400
So Henry had 400 and Andy had 320
check: after giveaway
Andy is left with 240
Henry now has 480
Does Andy have half of what Henry has?? YES

math  Ariana Grande, Monday, May 26, 2014 at 8:47am
at start:
Henry  x marbles
Andy  .8x marbles
after giveaway:
Henry  x+80
Andy  .8x  80
Andy's marbles = 1/2 of Henry's marbles
.8x80 = (1/2)(x+80)
times 2
1.6x  160 = x+80
.6x = 240
x = 400
So Henry had 400 and Andy had 320
check: after giveaway
Andy is left with 240
Henry now has 480
Does Andy have half of what Henry has?? YES

math  sseexx, Wednesday, July 15, 2015 at 11:49am
400for henry 320 for andy
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