Question

for the equation x over 3 equals 15 the student found the value of x to be 5 explain the error what is the correct answer

Answer 1

If you divide 5 over 3 you get the decimal 1.6, not 15.
the correct answer would be 45. 
how do i get that? read below.
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to solve:
$\frac{x}{3} = 15$
1.multiply each side by 3, to get the 3 on the left side to cancel out. so you get x = 15 times 3.
2. 15 * 3 = 45