alleryStart learning →The difference of a number and six is 13. Find the number.
AThe number is 7
BThe number is 19
CThe number is 13
DThe number is 78
Answer & Solution
Correct answer: B. The number is 19
1. Let n equal the unknown number.
2. The phrase difference of a number and six translates to n minus 6.
3. Set that equal to 13 and solve: n minus 6 equals 13, so n equals 19.
4. Check: the difference of 19 and 6 is 13, which matches.
_Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 3 "Math Models", section 3.1 Use a Problem-Solving Strategy_
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