Reduce each ratio to its minimum expression to find if they are equal.
35:28

10:8

Since both ratios reduce to 5:4, they are equivalent.
Another way to check a:b is equivalent to c:d, is that a*d = b*c
In this case, this will be true if 35 times 8 is equal to 10 times 28:

Since both products are equal, then the ratios are equivalent.
16/18, which is 8/9 reduced
Answer:
10.68
looks like you did all the work already...
16+18+19 + .... = 100
32+108+190+...= 1068
1068/100 = 10.68
Step-by-step explanation: