Question

If x varies directly as y. if x = 16 y = 80 , find x when y = 45

• A. 18
• B. 9
• C. 21
• D. 32

Answer 1

The correct option is B

9

Since x varies directly as y , we have

x y

16 80

$x_1$ 45

Hence cross multiplying ,we get 16 $\times$ 45 = 80 $\times x_1$

$x_1$ = $\frac{16\times 45}{80}$

= 9