Answer: 54

Explanation:
As there is meal for 70 adults and 28 have their meal, the meal left can be catered to 42 adults.
Now, 70 adults = 90 children
7 adults = 9 children
Therefore, 42 adults = 54 children
Hence, the meal can be catered to 54 children.

Answer: 48 paise

Explanation:
Let the required cost be x paise. Less weight, Less cost (Direct proportion)
Hence, 250 : 200 :: 6 : x
           x = (200 * 60)/ 250 = 48

Answer: 24

Explanation:
Let the number of workers initially hired be x.

Hence, x workers can complete the work in 25 days and (x-9) workers can complete the work in 40 days.

Now, the number of men and the amount of work are in direct proportion and number of men and number of days in indirect proportion.
x*25 = (x – 9)*40
25x = 40x – 360
15x = 360
x = 24

Answer: Rs 220

Explanation:
Let the require price be Rs x. Then, less toys, Less cost (direct proportion)
Hence, 6 : 5 :: 264 : 37
           6x = (5 * 264.37)
           x = ( 5 * 264.37) / 6
           x = (5 * 264.37) / 6
              
              = 220.308

Answer: 195

Explanation:
Let the required time be x seconds. Then, More metres, more time ( Direct Proportion)

0.128 : 25 :: 1 : x
0.128 x x = 25 x 1

x =   25
     0.128

x = 25 x 1000
         128

x = 195.31
Required time = 195 sec (approximately)

Answer: 22.8 kg

Explanation:
Let the required weight be x kg. Then, Less lenght, Less weight (Direct Proportion)

11.25 : 6 :: 42.75 : x
11.25 x x = 6 x 42.75

x = (6 x 42.75)
         11.25
x = 22.8

Answer: 12.5 m

Explanation:
Let the height of the building x metres.
Less lengthy shadow, Less in the height (Direct Proportion)
40.25 : 28.75 :: 17.5 : x
40.25 x x = 28.75 x 17.5
x = 28.75 x 17.5
            40.25
x = 12.5

Answer: Rs (yd)/x

Explanation:
Cost of x meters = Rs d . Cost of 1 metre = Rs d/x
Cost of y mts = Rs (d/x * y) = Rs (yd) / x

Answer: 25

Explanation:
As the camp has a reserve for 250 personnel that can last for 40 days, after 10 days the reserve left for 250 personnel is for 30 days. Now 50 more personnel are added in the camp.
Hence, the food reserve for 300 personnel will last for:

250:300::x:30 ……..(it is an indirect proportion as less men means more days)
x = (250*30)/300
x = 25 days

Answer: 22.8 kg

Explanation:
Let the required weight be x kg. Less length, less weight (direct proportion)
Hence, 11.25 : 6 ::42.75 : x
 => x = (6 * 42.75)/11.25
      x = 22.8