A + B = 15
A - B = 3
- Which letter has a bigger value?
- What is the total value?
- Find B.
- Find A.
(a)
A - B = 3
So, A is has a bigger value than B.
(b)
A + B = 15
So, the total value is 15.
(c)
B = 1 u
A = 1 u + 3
Total
= 1 u + 1 u + 3
= 2 u + 3
2 u + 3 = 15
2 u = 15 - 3 = 12
1 u = 12 ÷ 2 = 6
B = 6
(d)
A
= 1 u + 3
= 6 + 3
= 9
Answer(s): (a) A; (b) 15, (c) 6; (d) 9