At first, Charlie had 30 mini cupcakes and Ken had 6 times as many mini cupcakes as Charlie. After they each received an equal number of mini cupcakes from their best friend, Ken had four times as many mini cupcakes as Charlie. How many mini cupcakes did their best friend give to both of them altogether?
| |
Charlie |
Ken |
Difference |
| Before |
1x3 =
3 u |
6x3 =
18 u |
5x3 =
15 u |
| Change |
+ 2 u |
+ 2 u |
|
| After |
1x5 =
5 u |
4x5 =
20 u |
3x5 =
15 u |
Since both received an equal number of mini cupcakes, the difference in the number of mini cupcakes remains unchanged. LCM of 5 and 3 is 15.
3 u = 30
1 u = 30 ÷ 3 = 10
Number of mini cupcakes that each received
= 5 u - 3 u
= 2 u
Number of mini cupcakes that both of them received altogether
= 2 x 2 u
= 4 u
= 4 x 10
= 40
Answer(s): 40
