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Monday, July 24 2017 @ 09:45 AM CDT
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By: shino.dino (offline)  Tuesday, June 24 2014 @ 10:08 AM CDT (Read 1342 times)  
shino.dino

Please help with explanations.
thank you

Penny and David had 922 stamps. Penny gave 1/4 of her stamps to a friend while David bought 50 more stamps. Now, the number of stamps David has to the number of stamps Penny has is 1: 6. How many fewer stamps did David have than Penny at first?

ans: 806

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By: jo sarah (offline)  Tuesday, June 24 2014 @ 12:22 PM CDT  
jo sarah

In the end, ratio is:
Penny : David
...6.u..:.....1u
Penny's 6 units is from giving away 1/4, I.e., the 6 units is 3/4. So she had 8 units at first.
And David added 50 to result in 1 unit in the end.
So adding 50 to initial total of 922, we have 972, which is 8 + 1 = 9 units.
That means, 1 unit = 972 / 9 = 108

Difference in no. at first = (8 x 108) - (1 x 108 - 50) = 806

Trust this explains.

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By: shino.dino (offline)  Tuesday, June 24 2014 @ 07:36 PM CDT  
shino.dino

yes, I finally got a clearer picture.
thanks Wink

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