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primary 6 | Maths
| Percentage
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Date Posted: 3 years ago
Views: 250
25% = 1/4
Ratio of men to women = 4 : 1
But 1 cannot be divided by 4 to give a whole number. So change the ratio first by multiplying by 4.
4 : 1 = 16 : 4
25% of women would be 1 unit. So 1 unit of women left.
After they left, ratio of men to women
= 16 : 3
Difference = 16 units - 3 units = 13 units
Difference also = 325
So 325 people = 13 units
1 unit = 325 people ÷ 13 = 25 people
Units of people left
= 16 units + 3 units = 19 units
Another 205 men joined after this.
Total number of people at the end
= 19 units + 205
= 19 x 25 + 205
= 475 + 205
= 680
Ratio of men to women = 4 : 1
But 1 cannot be divided by 4 to give a whole number. So change the ratio first by multiplying by 4.
4 : 1 = 16 : 4
25% of women would be 1 unit. So 1 unit of women left.
After they left, ratio of men to women
= 16 : 3
Difference = 16 units - 3 units = 13 units
Difference also = 325
So 325 people = 13 units
1 unit = 325 people ÷ 13 = 25 people
Units of people left
= 16 units + 3 units = 19 units
Another 205 men joined after this.
Total number of people at the end
= 19 units + 205
= 19 x 25 + 205
= 475 + 205
= 680
See 2 Answers
done
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Date Posted:
3 years ago
usually students get a bit nauseous upon seeing improper fractions representing units ^_^ i’ll show another method using equivalent ratios that are easily divisible
Oh thanks!!! I shouldve known Hahahaha
This is the easiest and clearest method. I left a similar working in the main comments section very early but I think the student missed it out.
oh yea, you did! i missed it too.
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