點做ar?F.2 Maths

Let 3n be the larger number. (n is a positive integer)

Then 3(n-1) will be the smaller number; and

5(3n) >= 2*3(n-1)+45
15n >= 6n - 6 + 45
9n >= 39
n >= 4.333333

Therefore, the minimum value of n is 5;
And the numbers will be 15 and 12.

5x >= 2(x-1)+45

ans. 15,18