The number machine
A number is put into a machine.
First, the machine adds 7.
Then it doubles the result.
Finally, it subtracts 9.
The final answer is 25.
What was the original number?
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Solution: Work backwards
ReplyDeleteFinal answer: 25
Add 9: 25 + 9 = 34
Halve it: 34 ÷ 2 = 17
Subtract 7: 17 − 7 = 10
The original number was 10.