Zoe has 2 times as many marbles as Pamela. Pamela has
67 as many marbles as Mary. If the three of them have a total of 300 marbles, how many marbles does Mary have?
Zoe |
Pamela |
Mary |
2x6 |
1x6 |
|
|
6x1 |
7x1 |
12 u |
6 u |
7 u |
The number of marbles that Pamela has is repeated. Make the number of marbles that Pamela has the same. LCM of 1 and 6 is 6.
Total number of marbles that the three of them have
= 12 u + 6 u + 7 u
= 25 u
25 u = 300
1 u = 300 ÷ 25 = 12
Number of marbles that Mary has
= 7 u
= 7 x 12
= 84
Answer(s): 84