Which 15

Which two digits need to be interchanged to make the following equation correct?

16+7*2+4-3=12

A) 2 and 4

B) 7 and 4

C) 16 and 2

D) 7 and 3

Correct answer:

x = A

Step-by-step explanation:

$$\begin{gathered} a_1=16+7\cdot 4+2-3=43 \\ {b}_1=14 \\ {a}_2=16+4\cdot 2+7-3=28 \\ {b}_2=12 \\ {a}_3=12+7\cdot 6+4-3=55 \\ {b}_3=12 \\ {a}_4=16+3\cdot 2+4-7=19 \\ {b}_4=12 \\ x=A \end{gathered}$$

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