Question

Yuri solved the equation below incorrectly. Explain the step where he went wrong.

fifteen times b minus one equals thirty

Step 1: fifteen times b minus one minus one equals thirty minus one
Step 2: fifteen times b equals twenty-nine
Step 3: fifteen times b divided by fifteen equals twenty-nine divided by fifteen
Step 4: b equals twenty-nine fifteenths

Answer 1

15b - 1 = 30
15b - 1 - 1 = 30-1
15b - 2 = 29

step 1 : 1 should be added to both sides in order to get 15b = 31

Answer 2

the error is in step 2 - taking 1 from each side does not give 15b = 29