First, change 1 6/7 into an improper fraction. Multiply 7 times 1, plus 6 equals 13. So, 1 6/7 as an improper fraction is 13/7. Change 4 into an improper fraction by adding a 1 as the denominator. This is what your equation should look like: 4/1 x 13/7. Multiply numerator by numerator, denominator by denominator. 13 x 4 = 52, and 7 times 1 equals 7. So, the product is 52/7. Or, if you need it as a mixed number, the mixed number is 7 3/7. Hope this helped!
Easiest trick way to do this is do 26/546 on your calculator (if you got a scientific one) this would simplify this to its lowest fraction which can be converted into a ratio in this case the ratio of teachers to students is 1:21
