Fiona and Kathy collected coins. Fiona gave 30% of her coins to Kathy and as a result, Kathy's coins increased by 10%. If Fiona had 28 coins left, find the number of coins Kathy should give to Fiona in the end so that both had an equal number of coins.
| |
Fiona
|
Kathy |
Comparing the change
in Kathy's coins
|
|
Before
|
10x1 =
10 u |
|
10x3 =
30u |
|
Change
|
- 3x1 =
- 3 u
|
+ 3x1 =
+ 3 u
|
+ 1x3 =
+ 3 u
|
|
After
|
7x1 =
7 u
|
|
11x3 =
33 u |
30% =
30100 =
31010% =
10100 =
110The increase in the number of coins that Kathy had is repeated. Make the increase in the number of coins that Kathy had the same. LCM of 3 and 1 = 3
7 u = 28
1 u = 28 ÷ 7 = 4
Number of coins that Kathy had more than Fiona in the end
= 33 u - 7 u
= 26 u
Number of coins that Kathy should give to Fiona so that both had an equal number of coins in the end
= 26 u ÷ 2
= 13 u
= 13 x 4
= 52
Answer(s): 52
