Question

A taxi driver filled his car petrol tank with 20 litres of petrol in first day and 35 litres of petrol in second day. if the petrol costs ₹72 per liter how much did he spend in all on petrol ​

Answer 1

Petrol filled on Monday = 40 liters

Petrol filled on next day = 50liters

Total petrol filled = 90liters

Now, Cost of 1 liter petrol = Rs. 44

Cost of 90 liters petrol = 44 x90

= 44 x (100 – 10)

= 44 x 100 – 44 x10

= 4400 – 440

= Rs. 3960

Therefore, he spent Rs. 3960 on petrol.

Answer 2

Answer:

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What to do?

First we have to find the amount of petrol bought in these two days. Then, we have simply multiply it with the cost/litre in order to calculate the total money spent in it.

Amount of Petrol bought:

20 litres in first day.

35 litres in second day.

Total amount of Petrol bought = 20 + 35 l = 55 l

Cost of petrol:

(Per litre = ₹72)

⇒ Total cost = Amount of petrol × Cost/litre

⇒ Total cost = 55l × ₹72/l

⇒ Total cost = ₹3960

Hence,

Total cost of petrol for two days: ₹3960