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, the petrol costs $9.20. What was the old price for 1 liter?
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Answer:
The old price for 1 liter of petrol is 30 cents
Step-by-step explanation:
20 x a + 10 x (a+2) = 920 (cents)
20 x a + 10 x a + 20 = 920
30 x a + 20 = 920
30 x a = 920 - 20
30 x a = 900
a = 900 : 30
a = 30 (cents)
Hope it helps .
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