Harry and Fabian have some grey pens and some yellow pens. The number of yellow pens Harry has is equal to the number of grey pens Fabian has.
34 of Harry's pens are grey and
13 of Fabian's pens are yellow. There are a total of 16 grey pens. Find the total number of pens they have.
| Harry |
Fabian |
Total |
| Grey |
Yellow |
Grey |
Yellow |
|
| |
1x2 |
1x2 |
|
|
| 3x2 |
1x2 |
2x1 |
1x1 |
|
| 6 u |
2 u |
2 u |
1 u |
11 u |
The number of Harry's yellow pens and Fabian's grey pens is the same.
The number of Harry's yellow pens is repeated. The number of Fabian's grey pens is repeated. Make the number of Harry's yellow pens and Fabian's grey pens the same. LCM of 1 and 4 is 2.
Number of grey pens
= 6 u + 2 u
= 8 u
8 u = 16
1 u = 16 ÷ 8 = 2
Total number of pens
= 6 u + 2 u + 2 u + 1 u
= 11 u
= 11 x 2
= 22
Answer(s): 22
