Japheth and Luis had a total of 30 pens. Luis had half as many pens as Japheth. How many pens must Japheth give to Luis so they have an equal number of pens?
| |
Japheth |
Luis |
Total |
| Before |
2 u |
1 u |
30 |
| Change |
- ? |
+ ? |
|
| After |
1 |
1 |
|
Total number of pens at first = 3 u
1 u = 30 ÷ 3 = 10
Japheth and Luis have an equal number of pens in the end.
Number of pens that Luis has in the end
= 30 ÷ 2
= 15
Number of pens that Japheth must give to Luis
= 15 - 10
= 5
Answer(s): 5
