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25 Dec 2025, 12:11
Kudos
Bookmarks
Got a bit confused initially.
Firstly, directly proportional means:
C is proportional to P
C = k.P
1. origin rule:
if C = 0, P =0 and vice versa
2. scaling rule:
if C is multiplied by 'm' times, then P is also multiplied by 'm' times and vice versa.
3 kg of compost -> 72 cents.
6kg of compost -> 144 cents.
Ans: option B
Firstly, directly proportional means:
C is proportional to P
C = k.P
1. origin rule:
if C = 0, P =0 and vice versa
2. scaling rule:
if C is multiplied by 'm' times, then P is also multiplied by 'm' times and vice versa.
3 kg of compost -> 72 cents.
6kg of compost -> 144 cents.
Ans: option B
25 Dec 2025, 13:16
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Bunuel
Great Question
Price per kg directly proportional to fraction of compost
72 / 7 = k * (3/7)
K = 24
so for new mixture,
p / 21 = k * (6/21)
p / 21 = 24 * 6/21
p = 144
Ans - B
25 Dec 2025, 13:41
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Quote:
Price /kg = k(constant) x COMPOST(C) /C +(M)MANURE
Price of a mixture = Price/kg x Mixture Weight (C +M)
= K. x c/C+M x C+M. ----(c+m) and c+m will cancel out
= k x C
determining K
72 = K x 3
K = 24
Price of second mixture = K x 6 = 144.
hence B
