One-tenth of the cars in a car park are yellow. Another car arrives and now one-ninth of the cars are yellow.

### How many cars are now in the car park?

Check your answer:-

lets say there are total x cars, thus

x/10 number of cars are yellow initially.

x/10 number of cars are yellow initially.

as yellow car’s percent increases from 1/10th to 1/9th after new car arrives, so new car must be a yellow car.

So we can form this equation

1 + x/10 = (x+1)/9

Now we just need to solve this equation

on multiplying both sides by 9*10 =>

9*10 + 9x = 10x + 10

90 – 10 = 10x – 9x

x = 80

So there were 8 yellow cars initially among a total of 80 cars(i.e. 1/10th)

and a new yellow cars comes making 9 yellow cars in total of 81 cars.(i.e. 1/9th)

So **answer to the question is 81**. there are a total of 81 cars now.

Rohan Raj Srivastava says

(X+1)/9 – (X/10) = 1

SHARAD GUPTA says

X/10 + 1 = X/9

hence , no. of car i.e. X = 90