Ben had
38 the number of stamps that Japheth had at first. After Japheth gave Ben 15 of his stamps, Ben had
37 the number of stamps that Japheth had. How many stamps did Ben have at first?
| |
Ben |
Japheth |
Total |
| Before |
3x10 =
30 u |
8x10 =
80 u |
11x10 =
110 u |
| Change |
+ 3 u |
- 3 u |
|
| After |
3x11 =
33 u |
7x11 =
77 u |
10x11 =
110 u |
The total number of stamps that Ben and Japheth had at first and in the end remains unchanged. Make the total number of stamps the same. LCM of 11 and 10 is 110.
Number of stamps that Japheth gave Ben
= 33 u - 30 u
= 3 u
3 u = 15
1 u = 15 ÷ 3 = 5
Number of stamps that Ben had at first
= 30 u
= 30 x 5
= 150
Answer(s): 150
