If a quarter kg of potato costs 60 paise, how many paise will 200gm cost ?

Answer: Option D

Explanation:

There is meal for 200 children. 150 children have taken the meal.
Remaining meal is to be catered to 50 children.
Now, 200 children = 120 men

So, 50 Children = 120/200 * 50 = 30 men

Answer: Option B

Explanation:

Less shadow, Less Height (Direct Proportion)
So, let height of building be x metre
then,
$$\begin{aligned} 40.25 : 17.5 :: 28.75 : x \\ => x = \frac{17.5*28.75}{40.25} \\ => x = 12.5 \end{aligned}$$

So height of building should be 12.5 metre

Answer: Option C

Explanation:

More Men, Less Hours {Indirect Proportion}
Less Days, More Hours {Indirect Proportion}
$$\begin{aligned} \begin{bmatrix}Men & 15 & 10 \\Days & 12 & 18 \end{bmatrix} :: 6 : x \\ => x * 15 * 12 = 10 * 18 * 6 \\ => x = \frac{10*18*6}{15*12} \\ => x = 6 \end{aligned}$$

Answer: Option C

Explanation:

As it is given that food is there for 54 days for 2000 students,
But after 15 days, remaining food was sufficient for 2000 students for 39 days only ( as 54-15 = 39 )
Let x number of students came in hostel after 15 days,
=> Total number of students after 15 days = 2000 + x
=> Remaining food was enough for (2000 + x) students for 20 days
So here is indirect proportion, as more people and less food
=> 2000 : ( 2000 + x ) :: 20 : 39
=> 2000 * 39 = ( 2000 + x ) * 20
=> 3900 = 2000 + x
=> x = 3900 - 2000
=> x = 1900

Answer: Option D

Explanation:

Quarter of Kg means 250 gm

Less weight, less price (Direct Proportion)
So,
$$\begin{aligned} 250:200 :: 60:x \\ => x = \frac{200*60}{250} \\ => x = 48 \end{aligned}$$

So 200 gm will cost 48 paise.