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1. If x+y=4 and x-y=3, then x+2y is :
- A. 0.5
- B. 0.5
- C. 0.5
- D. 0.5
Answer: Option B
Explanation:
Here, x + y = 4
And, x - y = 3
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
So, 2x = 7 [by addition]
or, x = 7/2 = 3.5
So, 3.5 + y = 4 [from first equation]
or, y = 4 - 3.5 = 2.5
Then, x + 2y = 3.5 + 2×0.5 = 3.5 + 1 = 4.5
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