What does this rebus means ?

PROG WORKRESS

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Find the Goldfish below the given Image.

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

They did not eat the sweets in the way, nor threw or lose anything. Then, how can this be possible?

As a whole I am both
safe and secure.

Behead me and I become
a place of meeting.

Behead me again and I am
the partner of ready.

Restore me, and I become
the domain of beasts.

What am I?