The arithmetic mean of two numbers is 4.5. One number is 1.2. Find another number.
| June 15, 2021 | education
To solve this task, you need to make an equation. Let the unknown number be x. Knowing that the arithmetic mean of the numbers 1.2 and a is equal to 4.5, we draw up an equation.
(1.2 + a) / 2 = 4.5;
1.2 + a = 4.5 * 2;
1.2 + a = 9;
a = 9 – 1.2;
a = 7.8.
Answer: 7.8.
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