If two's company, and three's a crowd, then whats four and five ?

A woman named Maria was at the funeral of her mother. She met a nice young man that she had never seen before and after the service, they spent a bit of time together. Then she got busy and didn’t get his name or phone number before he left. She tried to find him, but no one knew who he was or how to contact him. A few weeks later, Maria’s older sister dies and the police suspect murder. Who killed the sister?

Can you count the number of blocks in the picture below?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

Find the next number in the following series:
6, 14, 26, 98, __?

What do the following words have in common?

Assess
Banana
Dresser
Grammar
Potato
Revive
Uneven
Voodoo