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Question
primary 6 | Maths
| Percentage
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How to do 1 and 2
So 100% - 25% = 75%
The number of boys are 75% the number of girls.
Total = 100% + 75% = 175%
Difference = 25%
= 25/175 x 1225
= 175
(You can also see this as
boys = 75 units,
girls = 100 units,
total = 175 units = 1225 people
Difference = 25 units )
Or
Ratio of boys to girls = 75 : 100
= 3 : 4
Total = 4 units + 3 units = 7 units
Difference = 4 units - 3 units = 1 unit
1225 x 1/7 = 175
① So let the total number of Malay books be 5 units. Then the number that's loaned out is just 2 units.
② Since number of English books are 4 times as many, you can find the number of units of English books easily from the info in step ①
25% = 25/100 = 1/4
With these info, you can easily find the answer. Idea is the same as previous question.
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