PSLE Zane had a total of 34 long and short rulers. After selling an equal number of both types, he had
34 of the long rulers and
25 of the short ones left. What was the total number of rulers left?
Fraction of the long rulers sold
= 1 -
34 =
14 Fraction of the short rulers sold
= 1 -
25 =
35 The number of long rulers and short rulers sold is the same.
Make the numerators the same.
LCM of 1 and 3 = 3
14 Long rulers =
35 Short rulers
1x34x3 Long rulers =
3x15x1 Short rulers
312 Long rulers =
35 Short rulers
|
Long |
Short |
Total |
Before |
12 u |
5 u |
17 u |
Change |
- 3 u |
- 3 u |
- 6 u |
After |
9 u |
2 u |
11 u |
Total number of rulers at first
= 12 u + 5 u
= 17 u
17 u = 34
1 u = 34 ÷ 17 = 2
Total number of rulers left
= 9 u + 2 u
= 11 u
= 11 x 2
= 22
Answer(s): 22