Question

If R is inversely proportional to A, and R = 4 when A = 100, what is the value of R when A = 250 A : .625 B : 1.6 C : 10 D : 6,250

Answer 1

Answer: (b)

Explanation:

Given

R is inversely proportional to A i.e

`R\propto (1)/(A)\\\\R=(C)/(A)\quad [\text{C=Constant}]`

when
`R=4,\ A=100`

Insert the values to get C

`\Rightarrow 4=(C)/(100)\\\\\Rightarrow C=400`

When A=250

`\Rightarrow R=(400)/(250)\\\\\Rightarrow R=1.6`

option (b) is correct