Family Puzzle

[mobilemu]

Start with a number larger than 0, square it, add 4, double it, takeaway 3, times it by 4 and finally subtract the original number. If you were now left with 20, what number did you start with?

[atsgran]

One ?

[quizman55]

The number that you require is one eighth, 1/8 or,0.125 in decimal.

0.125 squared = 0.015625 +4 = 4.015625 x 2 = 8.03125 -3 = 5.03125 x 4 = 20.125 minus original number =20

[wallacia]

thank you quizman 55.i have been trying this one for ages!