Michael has a total of 63 of pink and yellow markers.
15 of the pink markers and half of the yellow markers are new. How many of his yellow markers are new if he has a total of 15 new markers?
| |
Pink markers |
Yellow markers |
Total |
| Total |
5 u |
2 p |
63 |
| New |
1 u |
1 p |
15 |
| Old |
4 u |
1 p |
48 |
Number of old markers
= 63 - 15
= 48
1 u + 1 p = 15 --- (1)
4 u + 1 p = 48 --- (2)
(2) - (1)
(4 u + 1 p) - (1 u + 1 p) = 48 - 15
4 u - 1 u = 33
3 u = 33
1 u = 33 ÷ 3 = 11
Number of new yellow markers
= 15 - 1 u
= 15 - 11
= 4
Answer(s): 4
