Question 40

What will come in the place of ‘?’ in the following equation, if ‘+’ and ‘ - ‘ are interchanged and also ‘$$\times$$’ and ‘$$\div$$’ are interchanged?
$$42 + 10 \times 5 − 9 \div 1 = ?$$

Solution

$$42+10\times\ 5-\frac{9}{1}=?$$

after interchanging + and - * and / this will be
$$42-\frac{10}{5}+9\times\ 1=?$$

$$42-2+9=?$$

$$40+9=?$$

$$49=?$$

Hence option B is the correct answer

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What will come in the place of ‘?’ in the following equation, if ‘+’ and ‘ - ‘ are interchanged and also ‘$$\times$$’ and ‘$$\div$$’ are interchanged?$$42 + 10 \times 5 − 9 \div 1 = ?$$