To begin, double your shoe size by five. Step two is to add 50 to that number and then increase that sum by 20. You then add 1,015 to that amount and deduct the year you were born.

The first two digits of the four-digit figure represent your shoe size, and the following two indicate your age.

The following information is required: birth year, shoe size, and whether or not a birthday occurred.

Let Y represent the birth year and s represent the shoe size. Assuming the birthday occurred.

Step 1: Assume that s is already the closest integer (say 4, 5, 10, et cetera)

Step 2: Divide s by 5 to obtain 5 * s = 5 s.

Step 3: Multiply 5 s by 50 to get 5 s + 50.

Step 4: Divide by 20 to get: (5 s + 50) * 20 = 5 s * 20 + 50 * 20 = 100 s + 1000

Step 5: If you have a birthday, add 1020; otherwise, add 1019. Assume a birthdate of 1020.

happened. 100 + 1000 equals 100 + 1000 + 1020 = 100 + 2020. Take note that 2020 is this year!!!

Step 6: Subtract the year of birth: 100 s + 2020 equals 100 s + (2020 – Y).

This year, 2020 - Y (the year we were born) is our birthday!

RIDDLE FOR SHOE SIZE:

1. Take your shoe size and round it up to the nearest integer.

2. 5 times the sum

3. Add 50.

4. Divide by 20.

5. If it is your birthday

Source: Mycalcu.com