​Which of the following equations is INCORRECT?​

Correct option is C

Solution: ​

From option(a):  

8 × 3 + 63 ÷ 9 – 6 = 25 

8 × 3 + 7 – 6 = 25

24 + 7 – 6 = 25

25 = 25 

This is correct,

From option(b): 

​42 ÷ 6 + (2 × 5) × 1 + 9 = 26​

7 + 10 + 9 = 26

26 =26 

This is correct,

From option(c): 

​13 – 7 + 8 × 9 + 63 ÷ 7 = 86

13 – 7 + 72 + 9 = 86

6 + 72 + 9 = 86 

87 = 86 

This is incorrect.

From option(d): 

​9 × 4 + (12 + 2) – 30 ÷ 3 = 40 

36 + 14 – 10 = 40

36 + 4 = 40 

40 = 40 

Thus, Option(c) is correct.

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