The original answer for that question would be 303.55. The best estimate when you round to the nearest tenth the approximate answer would be 303.6 because the 5 in the hundredths place rounds the 5 in the tenths place to a 6. So the approximate answer would be 303.6....hope this helps.
Check out the pdf attached to see how to do this problem. It will give you a way of solving all ratio problems. But the final answer 176-124 = 52 there are 52 more girls than boys.