Question : Directions: Which two signs should be interchanged to make the given equation correct?
17 + 10 × 5 ÷ 9 + 18 = 53
Option 1: + and ÷
Option 2: + and ×
Option 3: + and –
Option 4: × and ÷
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Correct Answer: × and ÷
Solution :
Given:
17 + 10 × 5 ÷ 9 + 18 = 53
Let's check the options –
First option:
+ and ÷
In the given equation, two + signs are present, and it's unclear which one should be interchanged. So, this option is incorrect.
Second option:
+ and ×
In the given equation, two + signs are present, and it's unclear which one should be interchanged. So, this option is incorrect.
Third option:
+ and –
In the given equation, two + signs are present, and there is no – sign. So, this option is incorrect.
Fourth option:
× and ÷
On interchanging the mathematical signs, we get –
= 17 + 10 ÷ 5 × 9 + 18
= 17 + 2 × 9 + 18
= 17 + 18 + 18
= 53
So, only the fourth option satisfies the given equation. Hence, the fourth option is correct.
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