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Bunuel
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APram
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The weight is given as whole number bro
APram
Question
What is x?

Statement 1
x + 6 < 186
Insufficient
Statement 2
x+8>186
Insufficient

Combining 1 and 2
x+6<186<x+8
=> 178<x<180

Only possibility is 179 and it's unique
So C is answer
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Important thing to remember:

What is a whole number ?
-> It is a number without fractions; an integer.

-> Whole numbers are the set of non-negative integers, including zero and all the positive counting numbers (1, 2, 3, ...). They do not include negative numbers, fractions, or decimals.

so from the question, combining the only answer you get between 178 & 180 is X = 179

Hence C
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If Tim weighs X, where X is a whole number, what is Tim's weight?

(1) If Tim gains 6 pounds, he will weigh less than 186 pounds.
Tum weight is less than 186-6=180 pounds.
Insufficient

(2) If Tim gains 8 pounds, he will weigh more than 186 pounds.
Tim weight is more than 186-8=178
Insufficient

(1)&(2) 178<Tim<180 = 179 pounds
Sufficient

C
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