Page 164 - MATHEMATICS COURSE FOR SECONDARY SCHOOLS BOOK 2

7 These are 4 boys to every 7 girls in a class of 33 students. How many girls are in the class?
8 Lawrence is expenditure in December in creased in the ratio 9;4. As a result he spent $475 more. What was Lawrence’s expenditure in November?
9 The monthly rental of a taxi decreased in the ratio 5:6. As a result $125 was saved. What was the original rent?
10 The directions of a label reads ‘Mix 4 parts of medicine with 5 parts of water?
(a) How much medicine is needed to mix with 5 ml of water?
(b) How much water is needed to mix with 7.5 ml of water?
11 2 parts of pineapple juice to 3 parts of
mango juice are mixed to make a drink.
(a) How much mango juice is needed to mix with 15 ml of pineapple juice?
(b) How much pineapple juice is needed to mix with 25 ml of mango juice?
12 A man earns $450 a month.
(a) If the ratio of his expenditure to his income is 5:7, what is his
expenditure?
(b) What is the ratio of his savings to his income?
13 The price of a book is increased in the ratio 9:4. Find the new price of the old price was $48?
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