Fill in the blanks in units (Eg 3 u) or unit equations (Eg 1 u + 2).

Adam, Charlie and Bryan have some beads.
After Adam's number of beads is doubled,
Charlie's number of beads is increased by 20 and
Bryan's number of beads is reduced by 19,
the ratio of the number of stickers of Adam to Charlie to Bryan becomes 4 : 6 : 5.

Let the number of stickers that Bryan has in the end be 5 u.

1. Number of beads that Adam has at first = _____
2. Number of beads that Charlie has at first = _____
3. Number of beads that Bryan has at first = _____
4. Total number of beads that they have at first = _____

	Adam	Charlie	Bryan
Before	2 u	6 u - 20	5 u + 19
Change	x 2	+ 20	- 19
After	4 u	6 u	5 u

(a)
Change information into units.

Number of beads that Adam has at first
= 4 u ÷ 2
= 2 u

(b)
Number of beads that Charlie has at first = 6 u - 20

(c)
Number of beads that Bryan has at first = 5 u + 19

(d)
Total number of beads that they have at first
= 2 u + 6 u - 20 + 5 u + 19
= 2 u + 6 u + 5 u - 20 + 19 
= 13 u - 1

Answer(s): (a) 2 u; (b) 6 u - 20; (c) 5 u + 19; (d) 13 u - 1