Find the next number in the sequence

1, 2, 6, 21, 88, __?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

Why do we preferably have round manhole covers and not square ones?

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with a capacity of 4 litres, 8 litres and 10 litres and you have a large tank of water. Now you have to measure 3 litres of water precisely using those buckets. How will you do it?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?