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Question

Simplify the given expression-
$21 \times (23 - 12) - ((-1 \times 10) + 21)$

This question was previously asked in
RRB ALP 2018 CBT 2 Fitter Question Paper (21-Jan-2019) (Shift 3)
The correct answer is
220

Simplify Expression Calculation

Simplify the expression $21 \times (23 - 12) - ((-1 \times 10) + 21)$ using the order of operations (PEMDAS/BODMAS).

Expression Simplification

  1. Parentheses: Simplify inside the parentheses first. Calculate $(23 - 12)$ resulting in $11$. Calculate $(-1 \times 10)$ resulting in $-10$. The expression becomes: $21 \times 11 - (-10 + 21)$.
  2. Parentheses: Simplify the remaining part inside the second parenthesis. Calculate $(-10 + 21)$ resulting in $11$. The expression becomes: $21 \times 11 - 11$.
  3. Multiplication: Perform the multiplication. Calculate $21 \times 11$ resulting in $231$. The expression becomes: $231 - 11$.
  4. Subtraction: Perform the final subtraction. Calculate $231 - 11$ resulting in $220$.

Final Result

The simplified value of the expression is $220$.

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Important Questions from Integers

  1. Find the value of \(\sqrt{2025}\) .

  2. How many times does the number 5 occur in the range of numbers from 1 to 100?

    A. 21

    B. 22

    C. 20

    D. 19

  3. A prime number

    A. is not a positive integer.

    B. has no divisor at all.

    C. has only 1 and itself as divisors.

    D. has more than two divisors.

  4. __________ are twin prime number.

    A. (4, 9)

    B. (2, 3)

    C. (4, 6)

    D. (3, 5)
  5. A factory produced 18,58,509 cassettes in the month of January, 7623 more cassettes in the of February and owing to short supply of electricity produced 25,838 less cassettes in March than in February. Find the total production in all?

    A. 55,57,312

    B. 59,83,245

    C. 55,64,935

    D. 56,08,988
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