Harry has a total of 46 of grey and gold markers.
13 of the grey markers and half of the gold markers are new. How many of his gold markers are new if he has a total of 17 new markers?
| |
Grey markers |
Gold markers |
Total |
| Total |
3 u |
2 p |
46 |
| New |
1 u |
1 p |
17 |
| Old |
2 u |
1 p |
29 |
Number of old markers
= 46 - 17
= 29
1 u + 1 p = 17 --- (1)
2 u + 1 p = 29 --- (2)
(2) - (1)
(2 u + 1 p) - (1 u + 1 p) = 29 - 17
2 u - 1 u = 12
1 u = 12
1 u = 12 ÷ 1 = 12
Number of new gold markers
= 17 - 1 u
= 17 - 12
= 5
Answer(s): 5
