Question

What will come in the place of the question mark (?) in the following equation, if "+' and '-' are interchanged and 'x' and '÷' are interchanged? 18 ÷ 5 + 26 - 45 x 5 = ?

• A. 75
• B. 73
• C. 80
• D. 68

Answer 1

Answer:

B. 73

We are given:

Interchanges

• ‘+’ and ‘−’ are interchanged

• ‘×’ and ‘÷’ are interchanged

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18 ÷ 5 + 26 - 45 × 5

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$(÷ \leftrightarrow ×)$

$(+ \leftrightarrow -)$

So the expression becomes:
$18 × 5 - 26 + 45 ÷ 5$

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$18 × 5 = 90$
$45 ÷ 5 = 9$

$90 - 26 + 9$
$= 64 + 9$
$= 73$