Question 10

Which two signs should be interchanged to make the following equation correct?
$$20 \div 20 + 20 - 25 \times 25 = 419$$

Solution

As per the given question,

$$20 \div 20 + 20 - 25 \times 25 = 419$$

Now, from the given options, applying hit and trial method,

$$\Rightarrow 20 \times 20 + 20 - 25 \div 25 = 419$$

$$\Rightarrow 20 \times 20 + 20 - 1 = 419$$

$$\Rightarrow 400 + 20 - 1 = 419$$

$$\Rightarrow 420 - 1 = 419$$

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Which two signs should be interchanged to make the following equation correct?$$20 \div 20 + 20 - 25 \times 25 = 419$$