A couple who has 5 sons went for a picnic. Each son has 7 sisters. Each sister has 3 babies. In total, 
how many people went for the picnic?

 I have five eyes but cannot see. What am I?

What is in the middle of water but is not an island?

Wash me and I won't be clean, don't wash me, and I'll be clean. What am I?

When the sun sets l grow taller but when the sun is higher I'm lower.
What am I?

 I'm the child of water, but when you take me back to the water I'll die. Who am I?