Answer:
B
Explanation:
900mm is the current size of the pawn
The original size was 30mm which means we divide 900mm by 30mm
So,
900 ÷ 30 = 30
Which means b is the answer
C can't be the answer because if the original size of the pawn was 30mm and you say it was enlarged by 450mm, it means the current size will have to be 30 × 450 = 13500mm, and this is not the case