There are 268 cars, lorries and motorcycles in a car park.
There are 3 times as many cars as lorries.
There are 20 motorcycles.
(a) How many cars and lorries are there?
(b) How many lorries are there?

(a)

We know how many motorcycles are there, so the number of cars and lorries is the difference in the total number of cars, lorries, motorcycles and motorcycles

268-20=248.

So there are 248 cars and lorries

248 cars and lorries

(b)

Let the number of lorries be x, then the number of cars is 3x. There are 248 cars and lorries in total.

Now we can make an equation

So on the park there are 62 lorries. Then the number of cars is

There are 62 lorries and 186 cars