Lee Han Min's answer to Nicole She's Secondary 1 Maths Singapore question.
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I assume you have part 1. Just in case:
Total number of students: 42
Boys: 5/7 x 42 = 30
Girls: 2/7 x 42 = 12
Part 2
Since same number ( y) of boys and girls are selected,
Unselected boys : 30 - y
Unselected girls: 12 - y
Ratio of unselected boys : unselected girls = 7:1 so,
30 - y = 7 (12 - y)
I'm sure you can work out the rest! Cheers!
Total number of students: 42
Boys: 5/7 x 42 = 30
Girls: 2/7 x 42 = 12
Part 2
Since same number ( y) of boys and girls are selected,
Unselected boys : 30 - y
Unselected girls: 12 - y
Ratio of unselected boys : unselected girls = 7:1 so,
30 - y = 7 (12 - y)
I'm sure you can work out the rest! Cheers!
Date Posted:
4 years ago
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