CHAIN RULE

*The price of 357 mangoes is Rs.1517.25. What will be the approximate price of 49 dozens of such mangoes? Ans Rs.2,500

Difficulty Level : Easy Moderately easy Difficult

Basic Formula:
Direct Proportion



Answer with Explanation:
Let x be the cost of 49 dozens of mangoes
357 : (49 X12) = 1517.25 : x
357X x =
x = Rs. 2499
= Rs.2500 (approximately)

*The price of 438 oranges is Rs.1384.08. What will be the approximate price of 8 dozen of oranges? ans Rs.300

Difficulty Level : Easy Moderately easy Difficult

Basic Formula:
Direct Proportion


Answer with Explanation:
Let x be 8 dozens of oranges
438 : 8 X 12 = 1384.08:x
438x = 96 X 1384.08
X =
X = Rs. 300/-

*If 11.25m of uniform iorn rod weights 42.75kg. What will be the weight of 6m of the same rod? Ans Rs.22.8kg
Difficulty Level : Easy Moderately easy Difficult

Basic Formula:
Direct Proportion



Answer with Explanation:
Let x be the weight of the rod
Length Weight
11.25 42.75

x

11.25x = 6 X 42.75
X =
Weight of the rod = 22.8 kg.

*On a scale of a map 0.6 cm represents 6.6km. If the distance between two points on the map is 80.5 cm , the actual distance between these points is Ans:885.5km
Difficulty Level : Easy Moderately easy Difficult

Basic Formula:

Direct Proportion


Answer with Explanation:
Scale Distance
0.6 6.6
80.5 x

0.6 X x = 6.6 X 80.5
x =
x = 885.5 km.

*If 20 men working together can finish a job in 20 days, then the numbers of days taken by 25 men of the same capacity to finish the job is ans : 16

Difficulty Level : Easy Moderately easy Difficult

Basic Formula:

Indirect Proportion


Answer with Explanation:
Number of men Number of days
20 20
25 x

Let x be the number of days taken 25 men
20 X 20 = 25 X x
x = 400/25
x = 16 days

*If 10 men can reap a field in 8 days, then 8 men will reap the same field in : ans:10 days

Difficulty Level : Easy Moderately easy Difficult

Basic Formula:
Indirect Proportion



Answer with Explanation:
Number of men Number of days
10 8
8 x

Let x be the number of days taken 8 men
10 X 8 = 8 X x
x = 80/8
x = 10 days