Fill in the blanks in units (Eg 3 u) or unit equations (Eg 1 u + 2).
Adam, Bryan and Charlie have some beads.
After Adam's number of beads is doubled,
Bryan's number of beads is increased by 9 and
Charlie's number of beads is reduced by 7,
the ratio of the number of stickers of Adam to Bryan to Charlie becomes 10 : 3 : 3.
Let the number of stickers that Charlie has in the end be 3 u.
- Number of beads that Adam has at first = _____
- Number of beads that Bryan has at first = _____
- Number of beads that Charlie has at first = _____
- Total number of beads that they have at first = _____
|
Adam |
Bryan |
Charlie |
Before |
5 u |
3 u - 9 |
3 u + 7 |
Change |
x 2 |
+ 9 |
- 7 |
After |
10 u |
3 u |
3 u |
(a)
Change information into units.
Number of beads that Adam has at first
= 10 u ÷ 2
= 5 u
(b)
Number of beads that Bryan has at first = 3 u - 9
(c)
Number of beads that Charlie has at first = 3 u + 7
(d)
Total number of beads that they have at first
= 5 u + 3 u - 9 + 3 u + 7
= 5 u + 3 u + 3 u - 9 + 7
= 11 u - 2
Answer(s): (a) 5 u; (b) 3 u - 9; (c) 3 u + 7; (d) 11 u - 2