Question 760826
x varies directly as y. This means that:

(x/y) is a constant. Let us call this constant as "k". i.e. {{{x / y = k}}}

x = 24 when y = 8

So {{{k = 24/8 = 3}}}

When y = 10

{{{x/y = x/10 = k = 3}}}

{{{x/10 = 3}}}

Multiplying both sides by 10,

{{{x = 3*10 = 30}}}

When y = 10, x = 30.