Câu hỏi:
Out of 100 ladies attending the dance, 85 had a white hand bag; 75 had black shoes; 60 carried an umbrella; 90 wore a ring;
Đáp án:
10 Divide by 3. All the ladies had three items. The remainder shows the number of ladies who had 4. 85 75 60 90 ______ 310 / 3 = 100 + 10 remainder
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