APPSC Group-I Preliminary Exam 2019 Solved Paper 2

In a bag, there are a certain number of toy. blocks with alphabets $\mathit{A},\mathit{B},\mathit{C}$ and D written on them. The ratio of blocks $\mathit{A}:\mathit{B}:\mathit{C}:\mathit{D}$ is in the ratio $4:7:3:1$ .If the number of 'A' blocks is 50 more than the number of 'C' blocks, what is the number of 'B' blocks?