Gem has 2 times as many marbles as Barbara. Barbara has
27 as many marbles as Mary. If the three of them have a total of 26 marbles, how many marbles does Mary have?
| Gem |
Barbara |
Mary |
| 2x2 |
1x2 |
|
| |
2x1 |
7x1 |
| 4 u |
2 u |
7 u |
The number of marbles that Barbara has is repeated. Make the number of marbles that Barbara has the same. LCM of 1 and 2 is 2.
Total number of marbles that the three of them have
= 4 u + 2 u + 7 u
= 13 u
13 u = 26
1 u = 26 ÷ 13 = 2
Number of marbles that Mary has
= 7 u
= 7 x 2
= 14
Answer(s): 14
