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