what does the below rebus means?

John bought 150 chocolates but he misplaced some of them. His Father asked him how many chocolates were misplaced.
He gave the following answer to him:
If you count in pairs, one remains
If you count in threes, two remain
If you count in fours, three remain
If you count in fives, four remain
If you count in sixes, five remain
If you count in sevens, no chocolate remains.

Can you analyze the statements and tell us how many chocolates were lost?

Why is a river so rich ?

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

How do you go from 98 to 720 using just one letter?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

Decode this picture on T-Shirt and tell what it says ?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?