This question is about four positive whole numbers, A, B, C and D. You are not told the value of these numbers, but you are told that they follow these rules:
A = B multiplied by 2 B = C multiplied by 3 C =D multiplied by 4

(a) What must be the value of (B X C) + (A x D)?

(b) A is less than 250, what is the maximum possible value
of D?

(c) Which of A, B, C, D must be closest to the average of A, B,
C and D?