Question 35

Which two signs should be interchanged to make the given equation correct?
$$(560\div80)+90\times8-38=600$$

Solution

By Trial and Error method,

Option A

$$(560\div80)-90\times8+38=600$$

$$7-90\times8+38=600$$

$$7-720+38=600$$

$$-675=600$$

Hence Option A is incorrect

Option B

$$(560+80)\div90\times8-38=600$$

$$640\div90\times8-38=600$$

$$\frac{64}{9}\times8-38=600$$

The value will be decimal after solving which is not possible

Option C

$$(560-80)+90\times8\div38=600$$

$$480+90\times8\div38=600$$

$$480+720\div38=600$$

$$480+\frac{360}{19}=600$$

The value will be decimal after solving which is not possible

Option D

$$(560\div80)\times90+8-38=600$$

$$7\times90+8-38=600$$

$$630+8-38=600$$

$$600=600$$

Hence, the correct answer is Option D


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