The answer would be 450
2 × 225 = 450
3 × 150 = 450
5 × 90 = 450
6 × 75 = 450
9 × 50 = 450
10 × 45 = 450
Only five numbers are able to be multiplied by 10 between the numbers 420 and 480 (430, 440, 450, 460, 470)
From these five numbers only one is able to be multiplied by 9 (450)
That is how you get your answer