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Ray Of Light [21]
3 years ago
10

The average of 3, 15, and my number is 40. What is my number? I'll give 30 points!

Mathematics
1 answer:
stepan [7]3 years ago
3 0

Answer:

102

Step-by-step explanation:

The average is calculated using

average = \frac{totalscore}{count}

let your score be x, then

\frac{3+15+x}{3} = 40 ( multiply both sides by 4 )

18 + x = 120 ( subtract 18 from both sides )

x = 102 ← your number

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