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.
Questions that you need to ask
- Think of your age in years
- Multiply your age by 2
- Add 10
- Multiply by 5
- Add number of siblings that you have
- Subtract 50 from this number
- What's the number?
How it Works
Question Answer Example Algebraic Equivalent
1. Think of your age in years 15 [10x+y]
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
Prediction:
You are 15 years old, and you have 3 siblings.
The first two digits on the left (15) give your age, and the rightmost digit (3) gives the number of siblings you have.
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