Answer
1. a) 15 minutes is \( \frac{1}{6} \) of \( 1 \frac{1}{2} \) hours.
b) 35 metres is \( \frac{1}{3} \) of 105 metres.
2. a) The number halfway between \( \frac{1}{3} \) and \( \frac{5}{9} \) is \( \frac{4}{9} \).
b) The number halfway between \( \frac{7}{15} \) and \( \frac{1}{3} \) is \( \frac{2}{5} \).
3. a) \( \frac{1}{2} - \frac{9}{4} \times \frac{7}{6} + 2 = -\frac{1}{8} \)
b) \( \left(-\frac{1}{2}\right)^2 \times \left(-\frac{3}{4}\right)^2 = \frac{9}{64} \)
c) \( \sqrt[3]{-\frac{8}{216}} + \frac{1}{2} = \frac{1}{6} \)
d) \( \sqrt{\frac{16}{25}} = \frac{4}{5} \)
4. Three fractions between \( \frac{4}{10} \) and \( \frac{4}{5} \) are \( \frac{5}{10} \), \( \frac{6}{10} \), and \( \frac{7}{10} \).
5. The difference between \( \frac{3}{5} \) and \( \frac{2}{3} \) is \( -\frac{1}{15} \).
6. To subtract from \( \frac{8}{9} \) to get \( \frac{7}{8} \), subtract \( \frac{1}{72} \).
7. a) The fraction of members who are men is \( \frac{81}{144} \) or \( \frac{9}{16} \).
b) Mandisa received \( \frac{3}{4} \) of the votes. If \( \frac{1}{3} \) of the members voted, the number of votes she got is \( \frac{3}{4} \times \frac{1}{3} \times 144 = 36 \) votes.
8. The fuel tank's capacity is 180 litres.
9. Lungile has R 2560 left after taxes and expenses.
Total marks: 35
Solution
Let's solve the problems step by step.
### 1. a) Write 15 minutes as a fraction of \( 1 \frac{1}{2} \) hours.
**Known conditions:**
- 15 minutes = \( \frac{15}{60} \) hours = \( \frac{1}{4} \) hours.
- \( 1 \frac{1}{2} \) hours = \( \frac{3}{2} \) hours.
**Fraction calculation:**
\[
\text{Fraction} = \frac{\frac{1}{4}}{\frac{3}{2}} = \frac{1}{4} \times \frac{2}{3} = \frac{2}{12} = \frac{1}{6}
\]
### 1. b) Write 35 metres as a fraction of 105 metres.
**Known conditions:**
- 35 metres and 105 metres.
**Fraction calculation:**
\[
\text{Fraction} = \frac{35}{105} = \frac{1}{3}
\]
### 2. Find the number that lies halfway between these fractions.
#### a) \( \frac{1}{3} \) and \( \frac{5}{9} \)
**Finding the average:**
\[
\text{Average} = \frac{\frac{1}{3} + \frac{5}{9}}{2}
\]
**Finding a common denominator (9):**
\[
\frac{1}{3} = \frac{3}{9}
\]
\[
\text{Average} = \frac{\frac{3}{9} + \frac{5}{9}}{2} = \frac{\frac{8}{9}}{2} = \frac{8}{18} = \frac{4}{9}
\]
#### b) \( \frac{7}{15} \) and \( \frac{1}{3} \)
**Finding the average:**
\[
\text{Average} = \frac{\frac{7}{15} + \frac{1}{3}}{2}
\]
**Finding a common denominator (15):**
\[
\frac{1}{3} = \frac{5}{15}
\]
\[
\text{Average} = \frac{\frac{7}{15} + \frac{5}{15}}{2} = \frac{\frac{12}{15}}{2} = \frac{12}{30} = \frac{2}{5}
\]
### 3. Calculate.
#### a) \( \frac{1}{2}-\frac{9}{4} \times \frac{7}{6}+2 \)
**Calculating step by step:**
1. Calculate \( \frac{9}{4} \times \frac{7}{6} = \frac{63}{24} = \frac{21}{8} \).
2. Now calculate \( \frac{1}{2} - \frac{21}{8} + 2 \).
3. Convert \( \frac{1}{2} \) to eighths: \( \frac{1}{2} = \frac{4}{8} \).
4. Convert 2 to eighths: \( 2 = \frac{16}{8} \).
5. Now calculate: \( \frac{4}{8} - \frac{21}{8} + \frac{16}{8} = \frac{4 - 21 + 16}{8} = \frac{-1}{8} \).
#### b) \( \left(-\frac{1}{2}\right)^{2} \times\left(-\frac{3}{4}\right)^{2} \)
**Calculating:**
1. \( \left(-\frac{1}{2}\right)^{2} = \frac{1}{4} \).
2. \( \left(-\frac{3}{4}\right)^{2} = \frac{9}{16} \).
3. Now calculate \( \frac{1}{4} \times \frac{9}{16} = \frac{9}{64} \).
#### c) \( \sqrt[3]{-\frac{8}{216}}+\frac{1}{2} \)
**Calculating:**
1. \( -\frac{8}{216} = -\frac{1}{27} \).
2. \( \sqrt[3]{-\frac{1}{27}} = -\frac{1}{3} \).
3. Now calculate \( -\frac{1}{3} + \frac{1}{2} = -\frac{2}{6} + \frac{3}{6} = \frac{1}{6} \).
#### d) \( \sqrt{\frac{16}{25}} \)
**Calculating:**
\[
\sqrt{\frac{16}{25}} = \frac{\sqrt{16}}{\sqrt{25}} = \frac{4}{5}
\]
### 4. Find three fractions between \( \frac{4}{10} \) and \( \frac{4}{5} \).
**Converting to a common denominator (10):**
- \( \frac{4}{5} = \frac{8}{10} \).
**Fractions between \( \frac{4}{10} \) and \( \frac{8}{10} \):**
1. \( \frac{5}{10} \)
2. \( \frac{6}{10} \)
3. \( \frac{7}{10} \)
### 5. What is the difference between \( \frac{3}{5} \) and \( \frac{2}{3} \)?
**Finding a common denominator (15):**
1. \( \frac{3}{5} = \frac{9}{15} \)
2. \( \frac{2}{3} = \frac{10}{15} \)
**Calculating the difference:**
\[
\frac{9}{15} - \frac{10}{15} = -\frac{1}{15}
\]
### 6. What must be subtracted from \( \frac{8}{9} \) to give \( \frac{7}{8} \)?
**Setting up the equation:**
\[
\frac{8}{9} - x = \frac{7}{8}
\]
\[
x = \frac{8}{9} - \frac{7}{8}
\]
**Finding a common denominator (72):**
1. \( \frac{8}{9} = \frac{64}{72} \)
2. \( \frac{7}{8} = \frac{63}{72} \)
**Calculating:**
\[
x = \frac{64}{72} - \frac{63}{72} = \frac{1}{72}
\]
### 7. A golf club has 144 members, of whom 63 are women.
#### a) What fraction of the members are men?
**Calculating the number of men:**
\[
\
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