Question

a. Both u and v vary directly with each other. When u is 10, vis 15, which of the following is not a possible pair of corresponding values of u and v?
i. 2 and 3
ii. 8 and 12
iii. 15 and 20
iv. 25 and 37.5​

Answer 1

Answer: iii. 15 and 20

Step-by-step explanation:

Given, u and v vary directly to each other ⇒ u ∝ v.

So, u : v = 10 : 15 = 2 : 3.

Therefore all the pairs of numbers should be in ratio 2 : 3.

i) 2 : 3

ii) 8 : 12 = 2 : 3 (on dividing by 4)

iii) 15 : 20 = 3 : 4 (on dividing by 5)

iv) 25 : 37.5 = 1 : 1.5 (on dividing by 25) = 2 : 3 (on multiplying by 2)

Thus, (iii) 15 and 20 is the only option that does not satisfy the ratio.

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Answer 2

Answer:

Option : 3) is correct

Step-by-step explanation:

Hope this will help you