top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

1/10 of cars in a car park are yellow & another car arrives makes it 1/9 of cars yellow. How many cars now in car park?

0 votes
1,915 views

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?

posted May 22, 2017 by anonymous

Share this puzzle
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

0 votes

81 cars of which 9 are yellow.
.
First, there are y cars of which y/10 are yellow.
Now, there are y+1 cars of which (y+1)/9 are yellow.
The new car can be yellow or not. As the fraction of yellow increases, the new car has to be yellow.
.
Thus, y / 10 + 1 = (y+1) / 9.
This solves to y = 80 with 8 yellow cars. With the new yellow car, the parking lot now contains 81 cars.

answer May 22, 2017 by Jcm



Similar Puzzles
+2 votes

I am a 11 letter word
1,2,3,4 is a bank’s name
5,6,7 is a car’s name
8,9,10,11 is a mode of transport

What am I?

+1 vote

Everyone should have me, but in India many can’t get me…
Letters 9, 5, 9, 8 and 1, 8, 9 are names of popular small car models in India….
Letters 2, 3, 4, 5, 6, 7 represents an Italian bike manufacturer.

Who am I?

+1 vote

If 6 men and 8 women can do a piece of work in 10 days and 4 men and 7 women can do it in 12 days, how many days will 4 men and 12 women take to do half of work?

–1 vote

A bag contains Rs.1800 in form of one rupee, 50-paise and 25 paise coins in the ratio 3:4:12. How many coins are there of 25 paise?

0 votes

I am a noun having 6 letters.
Remove 1 & 2 and I am another noun.
Remove 1, 2 and replace letter 3 with letter ' T ' it is a name of fish.
Read from reverse the last three letter is also a noun

Find who I am?

...