Difficulty: Easy
Correct Answer: 11
Explanation:
Introduction / Context:Translate the statement into an equation, solve for the number, then compute the sum of its digits. This is a straightforward linear equation in one variable with a follow-up digit-sum calculation.Given Data / Assumptions:
Concept / Approach:Collect x terms on one side. Solve for x by isolating it using standard algebra. Then add the digits of the resulting number.
Step-by-Step Solution:
x − (4/7)x = 24.(3/7)x = 24 ⇒ x = 24 * 7 / 3 = 56.Sum of digits of 56 = 5 + 6 = 11.Verification / Alternative check:Check the sentence: 56 − 24 = 32 and (4/7)*56 = 32. Equality holds; digit sum 11 is confirmed.
Why Other Options Are Wrong:
Common Pitfalls:Subtracting in the wrong direction or mishandling fractions when moving terms. Multiply both sides as needed to avoid fraction errors.
Final Answer:
11
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