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

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

John had a bag containing colourful marbles. The colours are red, green and blue. The total number of marbles he had in his bag was 60. There are 4 times as many red marbles as green marbles. 6 more blue marbles than green marbles. How many marbles of each colour did John have?

What is the fastest way to double your money?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

Who can jump higher than a Mountain?

Can you write down eight eights so that they add up to one thousand?

Can you find the next number in the sequence?

113 119 101 114 116 ?

Three friends named Mr. Black, Mr. Yellow and Mr. Green enter a pub on a weekend night. They are wearing either a Black, Yellow or Green shirt.

Mr. Yellow says to them, 'Did you notice that we all are wearing different color shirts than our names?'

To this, the man who was wearing the Green shirt said. 'Wow, thats right.'

Can you identify who is wearing which colour shirt ?

Count the number of triangles in the below picture?