“Should we take the fire escape or the stairs?” asked Justin.
“I don’t know,” said David, “Let’s see…mmm… the stairs are a bit longer, but…”
“It’s not like we have time for thinking David!” interrupted Hannah, “It’s like wejust have to get out of here.”
“Hey, don’t interrupt,” said David, “it’s not nice,” but as he complained, the students looked up and saw the answer to their question. The blue smoke had formed into a strange sign. The sign said:
If the difference between the two numbers below is more than 537,
take the fire escape!
If it is less than 537,
take the stairs.
The two numbers are:
Find the difference between the two numbers!
(Should the students run to the stairs or fire escape?)
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