A number is subtracted from 15 and the result is 9. What is the number?

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Question: A number is subtracted from 15 and the result is 9. What is the number?

Options:

Correct Answer: 5

Solution:

Let the number be x. The equation is 15 - x = 9. Subtracting 15 from both sides gives -x = -6. Multiplying by -1 gives x = 6.

A number is subtracted from 15 and the result is 9. What is the number?

A number is subtracted from 15 and the result is 9. What is the number?

Step 1: Understand the problem. We need to find a number that, when subtracted from 15, gives us 9.
Step 2: Let the unknown number be represented by 'x'.
Step 3: Write the equation based on the problem: 15 - x = 9.
Step 4: To isolate 'x', we need to move 'x' to one side of the equation. We can do this by subtracting 15 from both sides.
Step 5: Subtract 15 from both sides: 15 - x - 15 = 9 - 15, which simplifies to -x = -6.
Step 6: Now, we need to get 'x' by itself. We can do this by multiplying both sides of the equation by -1.
Step 7: Multiply by -1: -1 * -x = -1 * -6, which gives us x = 6.
Step 8: The number we were looking for is 6.

Algebraic Manipulation – The question tests the ability to set up and solve a simple linear equation.
Understanding of Subtraction – The question assesses the understanding of the operation of subtraction and its effect on numbers.