10
Answer: BSet 10: Linear Equations (Intermediate)
Explanation
Tom is 3 years older than twice his sister's age. If Tom is 15, how old is his sister?
How old is Tom's sister?
A.
5
B.✓ Correct
6
C.
9
D.
7
Detailed Explanation
Choice B is correct. Let s = sister's age. 2 s + 3 = 15. 2 s = 12. s = 6.
Key Steps:
•
The correct answer is 6
Why others are wrong:
A: Choice A is incorrect and may result from a calculation error.
C: Choice C is incorrect and may result from a calculation error.
D: Choice D is incorrect and may result from a calculation error.
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