If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

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?

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

If an electric train is travelling south, then which way is the smoke going?

Why Wine Glass Stem is so long?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Some friends went on a vacation to a resort. It was raining heavily and it kept raining for thirteen days.

When it rained in the morning, the afternoon was beautiful and when it rained in the afternoon, the day was blessed with a clear morning.

Overall, the friends experienced eleven nice mornings and twelve nice afternoons. Can you find out the number of days they spent on vacation?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?