Question

The cost of a necklace varies as the square of teh number of diamond it contains. If a necklace containing 5 diamonds costs 10,000. Then how many diamonds does a necklace costing rs 19600 contain

Answer 1

Answer:

7 diamonds

Step-by-step explanation:

cost ∝ (number of diamond)^2

Let say n = number of diamonds

cost = k * (n)^2

k = constant

10000 = k * 5^2

10000 = 25 k

k = 400

Let say n = number of diamonds

19600 = 400 (n)^2

n^2 = 49

n = 7