Answer:
77
Step-by-step explanation:
sum of all number/total numbers
80+90+10+75+98+95+99/7
35 combinations of a starter and a main course.
1a, 1b, 1c, 1d, 1e, 1f, 1g
2a, 2b, 2c, 2d, 2e, 2f, 2g
3a, 3b, 3c, 3d, 3e, 3f, 3g
4a, 4b, 4c, 4d, 4e, 4f, 4g
5a, 5b, 5c, 5d, 5e, 5f, 5g
i hope this helps
47
3/14
We want to find the ratio of a to b, or a/b
9/17 = 3a/ (a+b)
Multiply each side by 17
17*9/17 =17* 3a/ (a+b)
9 = 51 a/ (a+b)
Multiply each side by (a+b)
9 (a+b) = 51a
Distribute the 9
9a +9b = 51a
Subtract 9a from each side
9a-9a +9b =51a-9a
9b = 42a
Divide each side by b
9b/b = 42a/b
9 = 42a/b
Divide each side by 42
9/42 = a/b
But we can simplify 9/42 because each is divisible by 3, so divide 9 and 42 by 3
3/14 = a/b
a<8 will make this true
