If you're saying that a×b=c, and a and b are the same number, then you need to find the square root of 60, or a number that will equal 60 when multiplied together since c=60. 60 is not a perfect square, but 7 squared is 49 and 8 squared is 64. So, the answer is going to be 7.something. If you √60 into a calculator, you get 7.74597. The five rounds up the four in the hundredths place, so the square root of 60 is about 7.75
Hope this helps!