Answer:
Explanation:
Now, in question the only information which is provided is that A car is covering a distance of 145 km in 10 litres of petrol. And we have to find how many kilometres a car will go in 20 litres of petrol and also how much petrol is required to cover a distance of 261 km.
Now, let us first find how many kilometres does a car cover in 1 litre of petrol.
Here, the car covers 145 kilometres of distance in 10 litres.
So, in 10 litres = 145 km distance covered.
So, distance covered by a car in 1 litre of petrol will be equals to
1 litre =14510
km
14510=14.5
km
That is, in one litre of petrol a car travels a total distance of 14.5 km.
Now, we have to find how many kilometres a car travels in 20 litres of petrol.
So, we have 1 litre =14510
km
Then, in 20 litre of petrol, we have
20 ×1 litre
=14510×20
km
On Simplifying, we get
14510×20=145×2km= 290 km.
Hence in 20 litres of petrol a car travels a total distance of 290 km.
Now, we have to find that, to cover 261 kilometres how much litres of petrol do cars need.
If, we have 1 litre =14510
km, then
We can re - write it as 10145litres=1km
which means t cover 1 kilometre of distance, we need 10145litres
of petrol.
So, for 261 km of distance petrol needed will be equals to
261×1km=261×10145litres
On simplifying, we get
261km=2610145litres
Dividing 2610 by 145, we get
261km=18litres
So, to cover 261 kilometres, 18 litres of petrol is needed by a car.