Fill in the blanks in units (Eg 3 u) or unit equations (Eg 1 u + 2).
Charlie, Bryan and Adam have some beads.
After Charlie's number of beads is doubled,
Bryan's number of beads is increased by 4 and
Adam's number of beads is reduced by 3,
the ratio of the number of stickers of Charlie to Bryan to Adam becomes 10 : 2 : 3.
Let the number of stickers that Adam has in the end be 3 u.
- Number of beads that Charlie has at first = _____
- Number of beads that Bryan has at first = _____
- Number of beads that Adam has at first = _____
- Total number of beads that they have at first = _____
|
Charlie |
Bryan |
Adam |
Before |
5 u |
2 u - 4 |
3 u + 3 |
Change |
x 2 |
+ 4 |
- 3 |
After |
10 u |
2 u |
3 u |
(a)
Change information into units.
Number of beads that Charlie has at first
= 10 u ÷ 2
= 5 u
(b)
Number of beads that Bryan has at first = 2 u - 4
(c)
Number of beads that Adam has at first = 3 u + 3
(d)
Total number of beads that they have at first
= 5 u + 2 u - 4 + 3 u + 3
= 5 u + 2 u + 3 u - 4 + 3
= 10 u - 1
Answer(s): (a) 5 u; (b) 2 u - 4; (c) 3 u + 3; (d) 10 u - 1