Tiffany and Jane had an equal number of erasers at first. Tiffany used
14 of her erasers and Jane used
17 of her erasers. They used 77 erasers altogether. How many erasers did Jane have in the end?
| |
Tiffany |
Jane |
| Before |
4x7 =
28 u |
7x4 =
28 u |
| Change |
- 1x7 =
- 7 u |
- 1x4 =
- 4 u |
| After |
3x7 =
21 u |
6x4 =
24 u |
The number of erasers that Tiffany and Jane each had at first is the same. Make the number of erasers that Tiffany and Jane each had at first the same. LCM of 4 and 7 is 28.
Number of erasers that Tiffany and Jane used
= 7 u + 4 u
= 11 u
11 u = 77
1 u = 77 ÷ 11 = 7
Number of erasers that Jane had in the end
= 24 u
= 24 x 7
= 168
Answer(s): 168
