Question

A student was asked to divide the half of a certain number by 6 and the other half by 4 and then add the two quantities so obtained.Instead of doing that

Answer 1

Answer:

Step-by-step explanation:

Let no be x

Given  

$\frac{1}{6}  \times  \frac{x}{2}  +  \frac{1}{4}  \times  \frac{x}{2}$

what student did

x/5

It means  

x/5  =  x/12  +  {x}/{8}  - 4

x/12+x/8-x/5=4

lcm of 5,8,12 =120

10x +15x -20x / 120 =4

x=120×4

x=480

so the answer is

480/2 ×1/6 + 480/2 × 1/4 = 100