Examine why they work ? Choose a number. Double it. Add nine. Add your

1.	Examine why they work ? Choose a number. Double it. Add nine. Add your original number. Divide by three. Add four. Subtract your original number. Your result is seven.
Answer» Choose a number = x say Double it = 2x Add nine = 2x + 9 Add your original number = 2x + 9 + x = 3x + 9 Divide by 3 = (3x + 9) ÷ 3 = 3x/3 + 9/3 = x + 3 Add 4 ⇒ x + 3 + 4 = x + 7 Subtract your original number = x + 7 – x = 7 Your result is 7 – True.

Examine why they work ? Choose a number. Double it. Add nine. Add your original number. Divide by three. Add four. Subtract your original number. Your result is seven.

Answer»

Choose a number = x say

Double it = 2x

Add nine = 2x + 9

Add your original number

= 2x + 9 + x = 3x + 9

Divide by 3 = (3x + 9) ÷ 3

= 3x/3 + 9/3 = x + 3

Add 4 ⇒ x + 3 + 4 = x + 7

Subtract your original number =

x + 7 – x = 7

Your result is 7 – True.