Answer: Arnold got 30 questions right.
Solution:
1. Identify the unknown
Percentage - ?
Base - 40
Rate - 75% (convert to decimal) 0.75
2. Identify the formula needed
Formula needed: Base × Rate = Percentage
3. Calculate
40 × 0.75 = 30 <---Answer
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Answers & Comments
Answer: Arnold got 30 questions right.
Solution:
1. Identify the unknown
Percentage - ?
Base - 40
Rate - 75% (convert to decimal) 0.75
2. Identify the formula needed
Formula needed: Base × Rate = Percentage
3. Calculate
40 × 0.75 = 30 <---Answer