B + A = 7
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 = 7
So, the total value is 7.
(c)
A = 1 u
B = 1 u + 3
Total
= 1 u + 1 u + 3
= 2 u + 3
2 u + 3 = 7
2 u = 7 - 3 = 4
1 u = 4 ÷ 2 = 2
A = 2
(d)
B
= 1 u + 3
= 2 + 3
= 5
Answer(s): (a) B; (b) 7, (c) 2; (d) 5