What has 13 hearts but no other organs?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

What has one eye, but can’t see?

Rose, Lily and Jasmine decided to buy flowers for their moms on Mother's Day. One of them bought lilies, the other roses, and the third one jasmines.
'It's funny!' said the girl with roses, 'we bought roses, jasmines and lilies, but none of us bought the flowers matching her name'.
'You're right!', said Lily.
What kind of flowers did each of the girls buy?

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?

Find the smallest sentence with all the English alphabet.

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

What has a bottom at the top?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?