In a store, the number of correction tapes was
710 of the total number of correction tapes and rulers together. Valen sold the correction tapes and rulers in sets of 1 correction tape and 2 rulers. After selling all the rulers, he still had 99 correction tapes left. How many rulers were in the store at first?
|
Correction Tapes |
Rulers |
Before |
7x2 = 14 u |
3x2 = 6 u |
Change |
- 1x3 = - 3 u |
- 2x3 = - 6 u |
After |
99 |
0 |
Since all the rulers were sold, the number of rulers at first and the number of rulers sold were the same. Make the number of rulers at first and sold the same. LCM of 3 and 2 is 6.
Number of correction tapes sold
= 14 u - 3 u
= 11 u
11 u = 99
1 u = 99 ÷ 11 = 9
Number of rulers at first
= 6 u
= 6 x 9
= 54
Answer(s): 54