Liam has a total of 68 of green and silver markers.
16 of the green markers and half of the silver markers are new. How many of his silver markers are new if he has a total of 18 new markers?
| |
Green markers |
Silver markers |
Total |
| Total |
6 u |
2 p |
68 |
| New |
1 u |
1 p |
18 |
| Old |
5 u |
1 p |
50 |
Number of old markers
= 68 - 18
= 50
1 u + 1 p = 18 --- (1)
5 u + 1 p = 50 --- (2)
(2) - (1)
(5 u + 1 p) - (1 u + 1 p) = 50 - 18
5 u - 1 u = 32
4 u = 32
1 u = 32 ÷ 4 = 8
Number of new silver markers
= 18 - 1 u
= 18 - 8
= 10
Answer(s): 10
