Question

Nisha did the work below to solve an equation.

Step 1 7b+3.2b-5=18.92

Step 2 10.2b-5=18.92

Step 3 5.2b= 18.92

Step 4 b=3.64.

In which step did Nisha make her first error?

Step 1

Step 2

Step 3

Step 4

Answer 1

Answer: step 3

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Answer 2

Step 3

Explanation:

Here, the given expression,

`7b + 3.2b - 5 = 18.92`

Since, when we solve the given expression the steps of solution are as follows,

Step 1 : 7b + 3.2b - 5 = 18.92

Step 2 : 10.2b - 5 = 18.92 ( Combining like terms in left side )

Step 3 : 10.2b = 23.92 ( Adding 5 on both sides )

Step 4 : b = 4.6 ( Dividing both sides by 10.2 )

Hence, by the above explanation it is clear that she made her mistake in step 3 ( she did not add 5 on right side )