I assume you mean PERCENTAGES right? Well if you do then some of the most common percentages are 50%, 75%, 25%, 80%, and many more some random ones I just thought of nw are 30%, 41% etc. I hope that's what you meant and I hope I helped?
58 * 1,000 = 58,000 its multiplication
I think the answer is 190 seconds because the equation 120=(50+x)/2 will help you.
