Impress your friends with this cool Mathematics puzzle. (and know how maths is useful in real life)
This lets you give the age of a person and the number of siblings in their family.
If you know an animal called Algebra, this would be a cakewalk for you. How it works is this. Follow the questions….
2. Multiply your age by 2 30 2[10x+y]
3. Add 10 40 2[10x+y] + 10
4. Multiply by 5 200 5{2[10x+y]+10}=100x+10y+50
5. Add # of siblings you have 203 100x+10y+50+z
6. Subtract 50 153 [100x+10y+50+z]–50= 100x+10y+z
The algebraic equivalent of the steps result in Step 6, which is 100x + 10y + z, where z<10. But 100x + 10y + z is the algebraic equivalent of a three-digit number, with the digits in the hundreds and tens places giving the age, and the digit in the ones place giving the number of persons in the house. (Note: the number of siblings has to be less than 10, otherwise this “trick” will not work.)
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