Prove that the below maths equation is true.

8 + 8 = 91

A bank customer had $100 in his account. He then made 6 withdrawals. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

Withdrawals Balance left
$50 $50
$25 $25
$10 $15
$8 $7
$5 $2
$2 $0
----- -----
$100 $99

Why are the Totals not tallying?

You see me once in June, twice in November, and not at all in May. What am I?

What can you catch but never throw?

Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

Count the number of triangles in the picture below:

What has many teeth, but cannot bite?

What is the word or phrase?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

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