# Chain Rule Questions and Answers Home > Numerical Tests > Chain Rule > Chain Rule Questions If a quarter kg of potato costs 60 yen, how many paise will 200 gm cost?

A. yen 48
B. yen 54
C. yen 56
D. yen 72

### Answer & Explanation:

Explanation: Let the required weight be x kg.

Less weight, Less cost (Direct Proportion)

250 : 200 :: 60 : x 250 x x = (200 x 60)

x= (200 x 60)/250

x = 48 In a dairy farm, 40 cows eat 40 bags of husk in 40 days. In how many days one cow will eat one bag of husk?

A. 1
B. 1/40
C. 40
D. 80

### Answer & Explanation:

Explanation:   A wheel that has 6 cogs is meshed with a larger wheel of 14 cogs. When the smaller wheel has made 21 revolutions, then the number of revolutions mad by the larger wheel is:

A. 4
B. 9
C. 12
D. 49

### Answer & Explanation:

Explanation: Let the required number of revolutions made by larger wheel be x.

Then, More cogs, Less revolutions (Indirect Proportion)

14 : 6 :: 21 : x <-> 14 x x = 6 x 21

x = (6 x 21)/14

x = 9 If 7 spiders make 7 webs in 7 days, then 1 spider will make 1 web in how many days?

A. 1
B. 7/2
C. 7
D. 49

### Answer & Explanation:

Explanation:  A flagstaff 17.5 m high casts a shadow of length 40.25 m. The height of the building, which casts a shadow of length 28.75 m under similar conditions will be:

A. 10 m
B. 12.5 m
C. 17.5 m
D. 21.25 m

### Answer & Explanation:

Explanation:   #### Square and Cubic Conversion

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