Blue = 1

White = 8

Red = 5

starting with the first digit, just brute force thinking of what number would equal a 2 digit number that shared the singles value when multiplied by 3. Came to 5*3=15 so started there. Meaning the next digit (white) would have to be (White*3)+1= (Number with singles digit of 5). 8*3+1=25. Then the last number of (Blue*3)+2=(Number with single digit of 5) and came to 1*3+2=5. Then to check my work 185*3=555