Gem has 2 times as many pens as Marion. Marion has
56 as many pens as Emma. If the three of them have a total of 105 pens, how many pens does Emma have?
Gem |
Marion |
Emma |
2x5 |
1x5 |
|
|
5x1 |
6x1 |
10 u |
5 u |
6 u |
The number of pens that Marion has is repeated. Make the number of pens that Marion has the same. LCM of 1 and 5 is 5.
Total number of pens that the three of them have
= 10 u + 5 u + 6 u
= 21 u
21 u = 105
1 u = 105 ÷ 21 = 5
Number of pens that Emma has
= 6 u
= 6 x 5
= 30
Answer(s): 30