Proportion

Proportional Logic

Draw

Determine the total of Triangle

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£1 can be exchanged for €1.25. How many pounds will I get if I exchange €100?

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Ewa buys $320 for £200. How many dollars can she buy for £800?

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12 pencils cost £1.80. How many pencils can be bought for £6?

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y is directly proportional to x. When x = 8, y = 24. Find y when x = 5.

Direct Proportion

a is directly proportion with b

a ∝ b

a=k.b , k=constant

k=a/b

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Neil travelled at 30 mph for 30 minutes. If he travelled at 60 mph over the same

distance, how long would it take?

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It takes 5 people 12 days to pitch a number of tents. Determine the people would take 10 days to pitch the same number of tents!

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12 workers can finish a building in 10 days. How long it takes if the workers just 4 person?

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y is indirectly proportional to x. When x = 2, y = 6. Find y when x = 3.

Indirect/Inverse Proportion

a is indirect proportion with b

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It takes 10 hours to fill a 200 m^3 tank using 4 pipes.

How long would it take to fill a 500 m^3 tank using 2 pipes?