Catch the Hidden Pattern in the Number Machine
A number machine works like this:
It takes a number, doubles it, then adds 6, then divides the result by 2.
The machine outputs 17.
What number did you put into the machine?
Word Problem
A bridge is built across a river. One quarter of the bridge is over the left bank of the river and one third of the bridge is over the right bank. The river is 120 m wide. How long is the bridge?
Let the input be x.
ReplyDeleteMachine steps:
Double it: 2x
Add 6: 2x + 6
Divide by 2: (2x + 6) ÷ 2 = x + 3
We’re told the output is 17, so:
x + 3 = 17
x = 14
Final Answer: 14