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What will come in the place of the question mark (?) in the following equation, if ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged? 15
Question

What will come in the place of the question mark (?) in the following equation, if ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged?
15 + 30 × 5 − 10 ÷ 7 = ?

A.

78

B.

76

C.

79

D.

77

Correct option is C

Interchange the operators as instructed:
+ ↔ −
× ↔ ÷
Original equation:
15 + 30 × 5 − 10 ÷ 7 = ?
After interchange:
15 − 30 ÷ 5 + 10 × 7 = ?
? = 15 − 6 + 10 × 7
? =  15 − 6 + 70
? = 15 + 70 − 6
? = 85 − 6
? = 79
Thus, the correct option is: (c)

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