question The average of three numbers is 15 If two of the numbers are 12 and 18 what is the third number

Math

The average of three numbers is 15. If two of the numbers are 12 and 18, what is the third number?

A. 14
B. 15
C. 16
D. 17

Use the formula for the average: Average=Sum of numbersNumber of numbersAverage=Number of numbersSum of numbers.

What is the value of 42÷2342÷23?

A. 2
B. 4
C. 6
D. 8

What is the name of a three-dimensional figure with all sides equal and all angles right angles?

A. Cube
B. Pyramid
C. Cylinder
D. Sphere

The sum of the angles in a hexagon is 720∘720∘. What is the measure of each interior angle?

A. 120∘120∘
B. 140∘140∘
C. 150∘150∘
D. 160∘160∘

If 3�+5=203e+5=20, what is the value of �e?

A. 5
B. 6
C. 7
D. 8

If 2�+5=152a+5=15, what is the value of �a?

A. 5
B. 6
C. 7
D. 8

The ratio of boys to girls in a class is 3:2. If there are 15 girls, how many boys are there?

A. 9
B. 12
C. 15
D. 18

Solve: 23+1432+41

A. 5665
B. 11121211
C. 712127
D. 1221

If 2552 of a number is 18, what is the number?

A. 25
B. 35
C. 40
D. 45

If �÷3=8e÷3=8, what is the value of �e?

A. 21
B. 24
C. 27
D. 30

If 3443 of a number is 36, what is 1441 of that number?

A. 12
B. 18
C. 24
D. 30