Answer:
(B)
Step-by-step explanation:
The given expression is:
\(\frac{1}{3}(x+18)=7\)
Upon solving the above expression, we get
\(\frac{1}{3}(x+18)=7\)
Step 1. Solving the above equation, we get
\(\frac{1}{3}x+6=7\)
Step 2. Subtracting 6 on both the sides of the above equation, we have
\(\frac{1}{3}x+6-6=7-6\)
Step 3. The equation can be written as:
\(\frac{1}{3}x=1\)
Step 4. Cross multiplying the above equation , we have
\(x=3\)
She made an error in step 2 as she added 6 on right hand side but in actual we have to subtract 6 on that side.
Thus, option (B) is correct.
