Quandaries
and Queries
From: Steve
secondary level question
Parent
Question: John likes 400 but not 300; he likes 100 but not 99; he likes 2500 but not 2400.
Which does he like?
900
1000
1100
1200
Hi Steve,
Look at the factors of numbers he likes and dislikes.
400 = 2
2
100 = 2
2500 = 2
300 =3
99 = 3
2400 = 2
The numbers he likes are all perfect squares and are only made up of 2's and 5's. Based on the given information there are two logical answers:
900, since it is a square, and
1000, since 1000 = 2
Penny