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Take your age:

Double it:

Add 5:

Multiply by 50:

Subtract 365:

Add the loose change in your pocket:

Add 115:

The first two digits in your answer are your age,

and the last two digits are the change in your pocket.

Let a = age and c = change in your pocket.

Then following the instructions above:

Your age: a

Double it: 2a

Add 5: 2a + 5

Multiply by 50: 100a + 250

Subtract 365: 100a - 115

Add the loose change in your pocket: 100a - 115 + c

Add 115 to get: 100a + c. (The 100 just moves the month over 2 places)