Directly proportional quantities
Types of exercises: a recipe for a different number of portions, fuel used on a route, is it direct proportion?.
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Problem
A recipe for 6 portions needs 1200 g of flour. How many grams are needed for 11 portions?
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Which quantities are directly proportional?
Problem
A car uses 4 litres of petrol per 100 km. How many litres will it use on a 350 km route?
Problem
A recipe for 7 portions needs 420 g of flour. How many grams are needed for 11 portions?
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The quantities x and y take the following pairs of values (x, y): (5, 20), (8, 32), (9, 36), (10, 40). Is y directly proportional to x?
Problem
A car uses 4 litres of petrol per 100 km. How many litres will it use on a 200 km route?
Problem
A recipe for 2 portions needs 140 g of flour. How many grams are needed for 5 portions?
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The quantities x and y take the following pairs of values (x, y): (2, 7), (7, 24.5), (8, 28). Is y directly proportional to x?
Problem
A car uses 14 litres of petrol per 100 km. How many litres will it use on a 450 km route?
Problem
A recipe for 2 portions needs 420 g of flour. How many grams are needed for 6 portions?
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