Fill in the blanks in units (Eg 3 u) or unit equations (Eg 1 u + 2).
Bryan, Adam and Charlie have some beads.
After Bryan's number of beads is doubled,
Adam's number of beads is increased by 9 and
Charlie's number of beads is reduced by 3,
the ratio of the number of stickers of Bryan to Adam to Charlie becomes 4 : 5 : 6.
Let the number of stickers that Charlie has in the end be 6 u.
- Number of beads that Bryan has at first = _____
- Number of beads that Adam has at first = _____
- Number of beads that Charlie has at first = _____
- Total number of beads that they have at first = _____
|
Bryan |
Adam |
Charlie |
Before |
2 u |
5 u - 9 |
6 u + 3 |
Change |
x 2 |
+ 9 |
- 3 |
After |
4 u |
5 u |
6 u |
(a)
Change information into units.
Number of beads that Bryan has at first
= 4 u ÷ 2
= 2 u
(b)
Number of beads that Adam has at first = 5 u - 9
(c)
Number of beads that Charlie has at first = 6 u + 3
(d)
Total number of beads that they have at first
= 2 u + 5 u - 9 + 6 u + 3
= 2 u + 5 u + 6 u - 9 + 3
= 13 u - 6
Answer(s): (a) 2 u; (b) 5 u - 9; (c) 6 u + 3; (d) 13 u - 6