SOLUTION: Please show me how to answer these problems. 1. a student has earnerd scores of 87,81,and 88 on the first 3of 4 test. Id the student wants an avearage(arithmetic means) of exact

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Question 4704: Please show me how to answer these problems.
1. a student has earnerd scores of 87,81,and 88 on the first 3of 4 test. Id the student wants an avearage(arithmetic means) of exactly 87, what score must she earn on the fourth test.
2. what is the average (arithemtic means) of 8,7,7,5,3,2,and 2?
3. Ben is making wooden toys for the next art sale. Each toy costs Ben $1.80 to make. If the sells the toys for $3.00 each. How many will he have to sell to make a profit of exactly $36.00?
Answer by liz2298(4) (Show Source):
You can put this solution on YOUR website!
Number 1: This is an average problem. Write in everything you know, substitute a letter for what you don’t know, and then solve for the unknown letter.

Number 2: This is another average problem. The average, or mean, is the total sum of all your numbers, divided by how many numbers you have. In this problem, you have 7 numbers. The sum of these numbers is (8 + 7 + 7 + 5 + 3 + 2+ 2 =) 34. The average is
Number 3: This is almost like an average problem. You still do the same thing. Write in everything you know, substitute a letter for what you don’t know, and then solve for the unknown letter.

For each toy Ben makes, he gets
$3.00 – $1.80 = $1.20 in profit.
To earn $36.00 in profit, he has to sell
$1.20 * x = $36.00, where x is the number he has to sell to make $36.00 in profit.