Last Saturday, Riordan had thrice as many marbles as Fabian. Today, Riordan gives 10 of his marbles to his best friend. Now, Fabian has twice as many marbles as Riordan. How many marbles does Fabian have?
| |
Riordan |
Fabian |
| Before |
3x2 =
6 u |
1x2 =
2 u |
| Change |
- 10 |
|
| After |
1 u |
2 u |
The number of marbles that Fabian had at first and in the end remains unchanged. Make the number of marbles that Fabian has the same. LCM of 1 and 2 is 2.
Number of marbles that Riordan gives to his best friend
= 6 u - 1 u
= 5 u
5 u = 10
1 u = 10 ÷ 5 = 2
Number of marbles that Fabian has
= 2 u
= 2 x 2
= 4
Answer(s): 4
