Jenson has 109 marbles and Henry has 242 marbles. How many marbles must Henry give to Jenson so that Jenson will have 117 less marbles than Henry?
| |
Jenson |
Henry |
Total |
| Before |
109 |
242 |
351 |
| Change |
+ ? |
- ? |
|
| After |
1 u |
1 u + 117 |
351 |
The total number of marbles remains unchanged after Henry gives to Jenson.
Total number of marbles
= 109 + 242
= 351
Total number of marbles in the end
= 1 u + 1 u + 117
= 2 u + 117
2 u + 117 = 351
2 u = 351 - 117
2 u = 234
1 u = 234 ÷ 2 = 117
Number of marbles that Henry must give to Jenson
= 117 - 109
= 8
Answer(s): 8
