Question

If x varies as y, and y = 4 when x = 12. find when
y = 15.
(a) 45
(c) 70
(b) 54
(d) 15

Answer 1

Answer:45

Step-by-step explanation:as y and x are in ratio of 1:3

Answer 2

The correct answer is 45.

Given:  x varies as y.

y = 4 when x = 12.

To Find: Value of x when y = 15.

Solution:

As x varies with y.

So, in y = 4 when x = 12.

$\frac{x}{y} =\frac{12}{4}=3$   (Equation1)

x is three times as y.

So, from equation 1.

$\frac{x}{15} =3$  

x = 45

Hence, the value of x is 45.

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