Question

If x varies directly with y and x = 2.5 when y = 10, find x when y = 16.

Answer 1

Answer:

x = 4

Step-by-step explanation:

If x varies directly with y

Directly Proportional:

$y\proto x$

$y=kx$

where, k is constant of proportionality

x = 2.5 when y = 10

$10=k\cdot 2.5$

$k=4$

Equation:

y=4x

Put y=16 and solve for x

$16=4x$

$x=4$

Hence, The value of x is 4 at y=16

Answer 2

Since 2.5 is a quarter of 10, u have to find a quarter of 16 which is 4. So X=4