ineed to get anaverage of 0.89 by adding any 4 numbers
(0.89 + 0.89 + 0.89 + 0.89)/4 = 0.89
or
{ (0.89 +a) + (0.89-a) + (0.89+2a) + 0.89 -2a) }/4 = 0.89
for any old a
so for example if a = 1
1.89 , -.11 , 2.89 , -1.11
which is better buy: $0.89 for 1 liter or $0.89 for 1 quart?
To achieve an average of 0.89 by adding 4 numbers, you need to consider the following steps:
1. Let's assume the numbers are a, b, c, and d.
2. Set up the equation to calculate the average:
(a + b + c + d) / 4 = 0.89
3. Multiply both sides of the equation by 4 to eliminate the denominator:
a + b + c + d = 4 * 0.89
4. Simplify the equation:
a + b + c + d = 3.56
Now, in order to find four numbers whose sum equals 3.56, you have several options. Here's one possible solution:
- Let a = 0.89.
- Let b = 0.89.
- Let c = 0.89.
- Let d = 0.89.
By adding these four numbers together: 0.89 + 0.89 + 0.89 + 0.89 = 3.56, which is the desired sum.
So, by choosing each number as 0.89, you will achieve an average of 0.89 by adding any 4 numbers.