exam Maths Puzzle Numerical Ability

I need help with this problem. I can not find any examples in my text book. It says to "change the following to a radical form, then simplify"
49 1/2
I dont even have a formula to follow. Thanks in advance.

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How many metric tons of chromium must be added to 2.50 metric tons of stainless steel to raise the percent chromium from 11% to 18%? I've tried several times to complete this problem. I've even attempted to draw a picture in order to have a visual. However, I have been unable to come up with the correct answer.