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Find the value of question mark(?) in th...

Find the value of question mark(?) in the following questions ?
`71+(72)/7xx56/(21)`=?

A

`(923)/7`

B

`689/7`

C

`(121)/4`

D

`9/(194)`

Text Solution

AI Generated Solution

The correct Answer is:
To find the value of the question mark (?) in the expression \( 71 + \frac{72}{7} \times \frac{56}{21} \), we will follow the order of operations, often remembered by the acronym PEMDAS (Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right)). ### Step-by-Step Solution: 1. **Write the expression clearly**: \[ 71 + \frac{72}{7} \times \frac{56}{21} \] 2. **Calculate the division**: First, we simplify \( \frac{56}{21} \): \[ \frac{56}{21} = \frac{56 \div 7}{21 \div 7} = \frac{8}{3} \] Now, substitute this back into the expression: \[ 71 + \frac{72}{7} \times \frac{8}{3} \] 3. **Multiply the fractions**: Now we multiply \( \frac{72}{7} \) by \( \frac{8}{3} \): \[ \frac{72 \times 8}{7 \times 3} = \frac{576}{21} \] 4. **Add to 71**: Now we add this result to 71. To do this, we need a common denominator. The common denominator for 71 (which can be written as \( \frac{71 \times 21}{21} \)) is 21: \[ 71 = \frac{71 \times 21}{21} = \frac{1491}{21} \] Now we can add: \[ \frac{1491}{21} + \frac{576}{21} = \frac{1491 + 576}{21} = \frac{2067}{21} \] 5. **Simplify the fraction**: Now, we simplify \( \frac{2067}{21} \): \[ 2067 \div 21 = 98.42857 \ldots \] This is approximately \( 98.43 \) when rounded to two decimal places. ### Final Answer: Thus, the value of the question mark (?) is: \[ \frac{2067}{21} \text{ or approximately } 98.43 \]
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