
By: shino.dino (offline) Tuesday, June 24 2014 @ 10:08 AM CDT (Read 1368 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

Newbie
Registered: 03/12/10 Posts: 8





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.

Regular Member
Registered: 03/20/12 Posts: 111





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



shino.dino 
yes, I finally got a clearer picture.
thanks

Newbie
Registered: 03/12/10 Posts: 8



