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    Question

    35% of 45% of 640 = z + 20.2, what is the sum of the

    squares of the digits in ‘z’?
    A 40 Correct Answer Incorrect Answer
    B 100 Correct Answer Incorrect Answer
    C 72 Correct Answer Incorrect Answer
    D 66 Correct Answer Incorrect Answer

    Solution

    ATQ,

    35% of 45% of 640 = z + 20.2

    Or, (7/20) × (9/20) × 640 = z + 20.2

    Or, 100.8 = z + 20.2

    Or, z = 80.6 → Take only digits: 8, 0, 6

    Required sum = 8² + 0² + 6² = 64 + 0 + 36 = 100

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