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Bunuel
Which of the following could be t if |5t – 8| < 1?

A. 5/8
B. 5/4
C. 5/3
D. 5
E. 10

prashantrchawla
Plug in the all the values given in the option, of t and check, only C satisfies the modulus. Hence, answer will be (C). What is OA

To supplement your explanation, plugging the answer choices in is a great start, but eliminating a few first helped me solve this quickly.

Looking at the question itself, 5t - 8 MUST equal a fraction for the absolute value to be less than 1. It's easy to see choices D and E are way too large to satisfy the equation. Eliminate.

Further examining the remaining answer choices, we need to find a choice for t that brings 5t's absolute value to just greater than 8. Choice A is too small. Eliminate.

Without putting pen to paper, I was able to eliminate 3 out of 4 choices by reading the question and taking a couple seconds to really understand what t needed to equal.

Plugging the remaining choices in, I arrived at C for the correct answer.
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-1< 5t – 8 < 1
-1+8 < 5t < 1+8
7< 5t <9
(7/5) < t <(9/5)
2.5 < t < 4.5

Only option (c) fits in this range.
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\(|5t – 8| < 1\)

\(-1 < 5t-8 < 1\)

\(7 < 5t< 9\)

This means the value of 5t should be \(in between 7 & 9\)

Now lets cross check the options.

\(A. 5/8\) = Value of \(5t = 5 * 5/8 = 25/8 = 3\).Something (Note we do not need to calculate exact value as we are looking for value which lies in between 7 & 9, 3 is not in between 7 & 9
\(B. 5/4\) = Value of \(5t = 5 * 5/4 = 25/4 = 6\).Something, 6 is not in between 7 & 9
\(C. 5/3\) = Value of \(5t = 5*5/3 = 25/3 = 8\).Something, 8.Something is definitely in between 7&9 - This is the Answer
\(D. 5\) = Value of \(5t = 5*5 = 25\), Clearly not in between 7*9
\(E. 10\) = Value of \(5t = 5*10 = 50\), Clearly not in between 7*9

Hence, the Answer is C = 5/3
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Bunuel
Which of the following could be t if |5t – 8| < 1?

A. 5/8
B. 5/4
C. 5/3
D. 5
E. 10

When (5t - 8) is positive, we have:

5t - 8 < 1

5t < 9

t < 9/5

When (5t - 8) is negative, we have:

-(5t - 8) < 1

-5t + 8 < 1

-5t < -7

t > 7/5

Thus, t could be 5/3.

Answer: C
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