A + B = 10
A - B = 4
- Which letter has a bigger value?
- What is the total value?
- Find B.
- Find A.
(a)
A - B = 4
So, A is has a bigger value than B.
(b)
A + B = 10
So, the total value is 10.
(c)
B = 1 u
A = 1 u + 4
Total
= 1 u + 1 u + 4
= 2 u + 4
2 u + 4 = 10
2 u = 10 - 4 = 6
1 u = 6 ÷ 2 = 3
B = 3
(d)
A
= 1 u + 4
= 3 + 4
= 7
Answer(s): (a) A; (b) 10, (c) 3; (d) 7