Question

how does the value of A and B
get in this question ??????​

Answer 1

Answer:

By adding equation (i) and (ii)

1. A+B+A-B = 90+30
2. + B and -B are cancelled , so 2A = 120
3. A = 60

Putting the value of A in equation (i)

1. A+B= 90
2. 60+ B = 90
3. B = 90-60
4. B = 30

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