Answer:

Step-by-step explanation:

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The three scores are 86, 74, and an unknown score x. The average (i.e. the sum divided by how many there are) is 80, so we have

Multiply both sides by 3 and you get

Subtract 160 from both sides to get

Note: you could solve this exercise very quickly if you notice that the two numbers, 86 and 74, are symmetrical with respect to 80, which is the average. So, the third number must be the average.
Well as you can see 5 x 2/3= 3 1/3 there is 7 steps to figure it out
1. set up the problem
5 x 2/3
2. put a 1 on 5 to make it a fraction
5/1 x 2/3
3. multiply and divide
(5 x 2) / (1/3)
4. find out the answer
10/3
5. turn the answer into a mixed fraction
10 divided by 3= 3.1 3 stays the same you don't need to say 1
6. it equals
3 1/3
7. so the answer is
3 1/3