Guan Ri Oh's answer to Akshaya's Primary 6 Maths question.
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If your algebra is not good, there is another way to solve this.
Groups of 12 were reduced to groups of 10, which means 2 people from each group were taken out and all these people, together with the 8 new participants, formed 3 more groups. Since each group has 10 people, 3 groups have 30 people. Subtract the 8 people who came late, you have 22 people. That gives 11 pairs of people who were previously from other groups, which means there were 11 groups at first. So on Day 2, there were 14 groups of 10, which makes 140 people on Day 2.
Groups of 12 were reduced to groups of 10, which means 2 people from each group were taken out and all these people, together with the 8 new participants, formed 3 more groups. Since each group has 10 people, 3 groups have 30 people. Subtract the 8 people who came late, you have 22 people. That gives 11 pairs of people who were previously from other groups, which means there were 11 groups at first. So on Day 2, there were 14 groups of 10, which makes 140 people on Day 2.
Date Posted:
7 years ago
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