alleryStart learning →The sum of twice a number and seven is 15. Find the number.
AThe number is 8
BThe number is 11
CThe number is 4
DThe number is 22
Answer & Solution
Correct answer: C. The number is 4
1. Let n equal the unknown number.
2. The phrase twice a number translates to 2n, and the sum of that with seven translates to 2n plus 7.
3. Set that equal to 15: 2n plus 7 equals 15.
4. Subtract 7 from each side and divide by 2 to get n equals 4.
_Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 3 "Math Models", section 3.1 Use a Problem-Solving Strategy_
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