Question

if I litre of petrol costs 70, how much do two and a half litres of petrol cost?​

Answer 1

$cost \: of \: 1 l \: petrol = rs70 \\ cost \: of \: 2 \frac{1}{2}l petrol = rs70 \times \frac{5}{2} = rs175</p><p>$

Hence ₹175 is correct ans.

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Answer 2

Given:

Cost of 1 liter of petrol= Rs.70

To find:

The cost of two and a half liters of petrol

Solution:

The cost of two and a half liters of petrol is Rs.175.

We can find the cost by following the given process-

We know that when the cost of 1 unit of an item is given, the cost of multiple items can be calculated by multiplying the cost of 1 unit with the total number of units.

The cost of 1 liter of petrol= Rs.70

So, the cost of two and a half liters or 2.5 liters=Cost of 1 liter×2.5

On putting the values, we get

The cost of 2.5 liters of petrol= 70×2.5

=70×25/10

=7×25

=Rs.175

Therefore, the cost of two and a half liters of petrol is Rs.175.