Aisha chose a whole number and multiplied it by 3. Which of the following numbers could not be her answer?
Correct answer: A. 103
- A. 103
- B. 105
- C. 204
- D. 444
Explanation
The very first solution that comes to our mind is the one that we learned in school. If the sum of digits in a number is a multiple of 3 then the number is a multiple of 3, e.g., for 612, the sum of digits is 9 so it's a multiple of 3. Here 1+0+3 equals 4 hence it is not a multiple of three, the others however are such 1+5 = 6 2+4= 6 4+4+4= 12 These are all divisible by 3 so are multiples of 3
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About Quantitative Reasoning
Quantitative reasoning applies arithmetic and basic algebra to numerical relationships, including percentages, ratios, averages, fractions, proportions, profit and loss, rates, time, work and measurement. Questions focus on translating words into equations, choosing an efficient method and checking whether the result is numerically reasonable.
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