Sub-topic 1
2013 · National Quarterfinal
Free
Joint variation: $z\propto\dfrac{x}{y}$ with $z=40$ when $x=100$, $y=20$
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Sub-topic 2
2013 · National Quarterfinal
Premium
Joint variation: $z\propto\dfrac{x}{y^2}$ with $z=2$ when $x=40$, $y=10$
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Sub-topic 3
2013 · National Quarterfinal
Premium
Joint variation: $z\propto\dfrac{x^2}{y^3}$ with $z=10$ when $x=8$, $y=4$
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Sub-topic 4
2013 · National Semifinal
Premium
Work rates: kofi and ama together take $10$ days and ama alone takes $15$ days
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Sub-topic 5
2013 · National Semifinal
Premium
Work rates: a farmer and his son together take $20$ days and the farmer alone takes $36$ days
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Sub-topic 6
2013 · National Semifinal
Premium
Work rates: adamu takes $3$ days and asare takes $5$ days, working together
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Sub-topic 7
2014 · National Quarterfinal
Premium
Inverse variation: $15$ workers build a road in $40$ days, so how long do $6$ workers take?
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Sub-topic 8
2014 · National Quarterfinal
Premium
Inverse variation: the number of men needed to paint a house in $15$ days instead of $12$
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Sub-topic 9
2014 · National Quarterfinal
Premium
Inverse variation: two carpenters roof a house in $7$ days, so how long do five take?
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Sub-topic 10
2023 · National One-Eighth
Premium
Joint variation $y=kxz$ with $y=12$ when $x=3$, $z=2$
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