Box S and Box T have a total of 90 chocolate bars. After 11 chocolate bars were transferred from Box S to Box T, there were 4 times as many chocolate bars in Box S as Box T. How many chocolate bars were there in each box in the end?
- Box S
- Box T
|
Box S |
Box T |
Total |
Before |
4 u + 11 |
1 u - 11 |
90 |
Change |
- 11 |
+ 11 |
|
After |
4 u |
1 u |
90 |
(a)
The total number of chocolate bars at first and in the end remains the same.
Total number of chocolate bars in the end
= 4 u + 1 u
= 5 u
5 u = 90
1 u = 90 ÷ 5 = 18
Number of chocolate bars in Box S in the end
= 4 u
= 4 x 18
= 72
(b)
Number of chocolate bars in Box T in the end
= 1 u
= 18
Answer(s): (a) 72; (b) 18