中文（繁體）
中文（简体）
English
S3 ICT: Algorithms and Flowcharts (Paper 2: intermediate)
S3 ICT: Algorithms and Flowcharts (Paper 2: intermediate)
S3 Geography population structure paper two, intermediate: ten questions that compute the total, child and old age ratios from one data set, then add the ageing index, compound growth and structural comparison.
Direct answers Answers in order: 45.8 per cent, 25.0 per cent, 20.8 per cent, 83.3, 104.2, about 530 219 people, 14.3 per cent, higher health and welfare spending, it hides which group creates the burden, and the denominator must be the working age group.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 |
| Suggested time | 20 |
| Difficulty mix | Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1 |
| Chapter | Chapter: S3 Geography: Population Structure and Dependency Ratio |
| Level | S3 |
02 Questions (10 items)
- FoundationTown A has 700 000 people, with 120 000 aged 0 to 14, 480 000 aged 15 to 64 and 100 000 aged 65 or over. What is the total dependency ratio?
- FoundationWhat is the child dependency ratio of Town A?
- FoundationWhat is the old age dependency ratio of Town A?
- IntermediateWhat is the ageing index of Town A, that is the 65 plus group as a percentage of the 0 to 14 group?
- IntermediateIf the child group of Town A falls to 96 000 with the elderly unchanged, what is the new ageing index?
- IntermediateA working age population of 480 000 grows one per cent a year. How many after ten years?
- ChallengeWhat percentage of the total population of Town A is aged 65 or over?
- ChallengeWhat happens to government recurrent spending when the dependency ratio keeps rising?
- ChallengeWhat is missed when two cities are compared only on total dependency ratio?
- Error redoA student computes the dependency ratio as dependants divided by total population. What is wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | (120 000 + 100 000) divided by 480 000, giving 45.8 per cent. | First check that the three groups add up to the total, then divide by the working age group. |
| 2 | 120 000 divided by 480 000, giving 25.0 per cent. | Exactly one quarter, so every four working age people support one child. |
| 3 | 100 000 divided by 480 000, giving 20.8 per cent. | Adding the child and old age ratios gives 45.8 per cent, matching the total ratio. |
| 4 | 100 000 divided by 120 000 and multiplied by 100, giving 83.3. | Only an index above 100 means there are more elderly people than children. |
| 5 | 100 000 divided by 96 000 and multiplied by 100, giving 104.2. | Fewer children shrink the denominator, pushing the index above 100 so the elderly outnumber children. |
| 6 | About 530 219 people. | Use compound growth, 480 000 times 1.01 to the tenth power, not a flat 4 800 a year. |
| 7 | 100 000 divided by 700 000, giving 14.3 per cent. | This common ageing indicator takes total population, not the working age group, as its denominator. |
| 8 | Health and welfare spending rises while the tax base shrinks in relative terms. | More dependants and a smaller working share squeeze public finances from both sides. |
| 9 | It hides whether the burden comes from children or from the elderly, which need very different spending. | An identical total ratio can come from many children or many elderly people, and the policy implications are opposite. |
| 10 | The denominator is wrong. It should be the 15 to 64 working age population. | Dividing by total population gives a share of the population, always lower than the true dependency ratio. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
An algorithm is a finite and unambiguous list of steps; flowcharts use a diamond for decisions and a parallelogram for input or output, combined through sequence, selection and iteration.Tutor Registration →
Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.