What does this rebus mean?

O
N
C
E
TIME

If 21x = 79x, what is the value of x?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

No one wants to have it, but if one got it, he does not want to lose it. What is It?

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

There is a hypothetical state between the USA and Mexico border 'Tango'.
Here 70 percent of the population have defective eyesight, 75 percent are hard of hearing, 80 percent have Nose trouble and 85 percent suffer from allergies, what percentage (at a minimum) suffer from all four ailments?