PSLE Archie had a total of 450 short and long rulers. After selling an equal number of both types, he had
25 of the short rulers and
35 of the long ones left. What was the total number of rulers sold?
Fraction of the short rulers sold
= 1 -
25 =
35 Fraction of the long rulers sold
= 1 -
35 =
25 The number of short rulers and long rulers sold is the same.
Make the numerators the same.
LCM of 3 and 2 = 6
35 Long rulers =
25 Short rulers
3x25x2 Long rulers =
2x35x3 Short rulers
610 Long rulers =
615 Short rulers
|
Long |
Short |
Total |
Before |
10 u |
15 u |
25 u |
Change |
- 6 u |
- 6 u |
- 12 u |
After |
4 u |
9 u |
13 u |
Total number of rulers at first
= 10 u + 15 u
= 25 u
25 u = 450
1 u = 450 ÷ 25 = 18
Total number of rulers sold
= 6 u + 6 u
= 12 u
= 12 x 18
= 216
Answer(s): 216