Question

. The cost of petrol rises by 2 cents a liter. last week a man bought 20 liters at the old price. This week he bought 10 liters at the new price. Altogether, petrol costs $9.20. What was the old price for 1 liter?

Answer 1

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Answer 2

Answer
$0.90 is the old price for 1 litre.

Solution step by step

Given N as New price
O as Old price

10 = $9.20 new price
1 = x new price
Cross multiply

$9.20x = 10N

$9.20x/10 = 10N/10
$0.92 = 1N
$0.92 per litre

To find Old price
$0.92 - 2 cents
Old price for 1 litre = $0.90

20 litre = $0.90(20)
20 litre = $18