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The number of girls in a study group was three more than twice the number of boys. There were 11 girls. How many boys were in the group?
A4
B7
C8
D3
Answer & Solution
Correct answer: A. 4
1. Let n equal the number of boys in the study group.
2. The number of girls, three more than twice the boys, translates to 2n plus 3.
3. Set that expression equal to 11 girls: 2n plus 3 equals 11.
4. Subtract 3 from each side and divide by 2 to get n equals 4 boys.
_Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 3 "Math Models", section 3.1 Use a Problem-Solving Strategy_
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