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 give-away:

Henry --- x+80

Andy ---- .8x - 80

Andy's marbles = 1/2 of Henry's marbles

.8x-80 = (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 give-away

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 give-away:

Henry --- x+80

Andy ---- .8x - 80

Andy's marbles = 1/2 of Henry's marbles

.8x-80 = (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 give-away

Andy is left with 240

Henry now has 480

Does Andy have half of what Henry has?? YES

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