Catherine's answer to Abigail lim :)'s Primary 6 Maths Percentage Singapore question.
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At first, there were 825 pupils, which is 100%. The boys was 52%, meaning there was 429 boys and 48% of girls, which is 396.
After the boys joined, the number of girls stayed constant but there was a change of percentage. Meaning that 396 (girls) became 36% when the boys joined. The boys became 64%.
1% (after)---> 396/36=11
Boys (after)---> 11x64=704
Boys joined---> 704-429=275
Answer is 275.
After the boys joined, the number of girls stayed constant but there was a change of percentage. Meaning that 396 (girls) became 36% when the boys joined. The boys became 64%.
1% (after)---> 396/36=11
Boys (after)---> 11x64=704
Boys joined---> 704-429=275
Answer is 275.
Date Posted:
10 months ago
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