In a class the ratio of boys to girls is 3 : 4 and there are 28 students. If 4 more boys join, what is the new ratio of boys to girls in simplest form?
Answer and explanation
Correct answer: C. 1 : 1
- Step 1: One part = 28 / 7 = 4, so 12 boys and 16 girls. Step 2. Add 4 boys: 16 boys and 16 girls, so the ratio is 1 : 1. Answer: 1 : 1. Why not the others: 3 : 4 is the original ratio; 4 : 3 is wrong since 16 = 16; 5 : 4 adds 4 to the parts not the students.
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