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The number that should be added to $− 13 4 + − 3 8$ to get 1 is:

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358

378

398

338

answer is B.

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Detailed Solution

Given a expression

− 13 4 + − 3 8

.
Let the required number = x,
According to the question,

− 13 4 + − 3 8 + x = 1 x = 11 − − 13 4 + − 3 8 x = 11 − − 13 4 + − 3 8

L.C.M of 4 and 8 = 8.
Now taking L.C.M and simplifying,

x = 8 + 26 + 3 8 x = 378

Number is

378

.
Hence, option 2 is correct.

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