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Sara has some oranges. She sold 40% more than she ate. If she sold 70 oranges, how many did she eat?
ball so hard  Feb 6, 2012
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 #1
avatar+247 
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She ate 30 oranges because she has 70 oranges

ate 40 more that she ate

add 30

= 70

Cue123smile  Nov 30, 2014
 #2
avatar+91471 
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No that is not correct Cue 

I like to do these in boxes.  Unfortunately I cannot put a frame around my boxes so you will have to imagine that they are there.   

AteSold
100%

140%

(of how much she ate)

this must be 100/2

50

70

note 140/2=70

 

A more normal way of doing this is to start by saying

S=140% of A

S=1.4A

sub in S=70

70=1.4A

A=50

She ate 50 apples.  I bet she got a big belly ache from that!

Melody  Nov 30, 2014

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