Eva and Abi had an equal number of marbles at first. Eva used
15 of her marbles and Abi used
19 of her marbles. They used 56 marbles altogether. How many marbles did Abi have in the end?
|
Eva |
Abi |
Before |
5x9 = 45 u |
9x5 = 45 u |
Change |
- 1x9 = - 9 u |
- 1x5 = - 5 u |
After |
4x9 = 36 u |
8x5 = 40 u |
The number of marbles that Eva and Abi each had at first is the same. Make the number of marbles that Eva and Abi each had at first the same. LCM of 5 and 9 is 45.
Number of marbles that Eva and Abi used
= 9 u + 5 u
= 14 u
14 u = 56
1 u = 56 ÷ 14 = 4
Number of marbles that Abi had in the end
= 40 u
= 40 x 4
= 160
Answer(s): 160