Correct option is D
Given:
Expression describing operations on an unknown number x: 3 × (2x + 9) = 171
Formula Used:
Linear equation in one variable.
Solution:
Let the original whole number be x.
Set up the equation based on the given wording:
3(2x + 9) = 171
2x + 9 =
2x + 9 = 57
2x = 57 - 9
2x = 48
x = 24
The original given number is 24. We are asked to subtract 3 from it.
Result = 24 - 3 = 21.
Among the provided options (5, 2, 13, 7), 21 is exclusively divisible by 7.
Final Answer
So the correct answer is (d)
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