Question

? +. ? =8
? -. ? =6
=. =
13. 8

Answer 1

a + b = 8........(1)
a - b = 6 ...... (2)
a - b = 6
=> a = 6 + b
Substituting a = 6 + b in (1) we get:
(6 + b) + b = 8
=> 6 + 2b = 8
=> 2b = 8 - 6
=> 2b = 2
=> b = 2 / 2
=> b = 1
Substituting b = 1 in (1) we get:
a + 1 = 8
=> a = 8 - 1
=> a = 7

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Answer 2

Answer:

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