how to find the dimensions under tapered conditions

how couldn't help understand the tapered conditions to figure out the dimensions i did looked into the internet for answers and from what I learned and I say this according to the image attached
1:50 means reduction/addittion in 1mm for every 50 mm length.i don't know if my math is right I got the dimension for the other end as 5.68 i'm I right? please correct me if i'm wrong

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