Can anyone tell me a word in the English dictionary which has a silent 'z'?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

who is silent in the parliament?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

Two friends decide to get together; so they start riding bikes towards each other. They plan to meet halfway. Each is riding at 6 MPH. They live 36 miles apart. One of them has a pet carrier pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth at 18 MPH between the 2 friends until the friends meet.

How many miles does the pigeon travel?

What is always in front of you but can’t be seen?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

A little girl goes to the store and buys one dozen eggs. As she is going home, all but three break. How many eggs are left unbroken?