Question

The distance, D km, travelled by a car is directly proportional to the amount, A litres, of petrol

used. When A = 5, D = 270
a) Express D in terms of A.
b) Find the value of D when A = 4.5
c) How many litres of petrol are needed for a journey of 324 km?
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Answer 1

D=54A

When A is 4.5 D=54×4.5 D=243

324=54×A A=324/54 A=6litre

Explanation:

D©A

D=k×A

270=K×5

K=270/5 k=54

D=54×A

When A is 4.5 D=54×4.5 D=243

324=54×A A=324/54 A=6litre