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1 . If x+y=4 and x-y=3, then x+2y is :

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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