niky wrote:
as for the numbers question... 900 1000 1100 1200... John always likes the number that is 100 higher... and the only number that this would hold true for in this case... but it's not a very elegant solution... :p
John doesn't always like the number that is 100 higher... then what about 99 and 100?
You're going the wrong direction there :wink:
Original Question:
Quote:John likes 400 but not 300; he likes 100 but not 99; he likes 2500 but not 2400. Which does he like?
John only likes the numbers that are perfect squares:
400= 20 * 20
100= 10 * 10
2500= 50 * 50
The numbers 300, 99, and 2400 are not perfect squares.
The choices were
900
1000
1100
1200
900= 30 * 30 and is a perfect square.
Therefore, 900 is the answer.