Question

If y is directly proportional to x and y is 12 when x = 10, what is y when x is 25?

Y = 25
Y = 30
Y = 20 5/6
Y = 26 1/5
None of the above

Answer 1

Y= 30

Explanation:

y=kx

when y=12, x=10

12=10k

k= 12/10

k = 6/5

when x= 25

y= 6/5 × 25

y= 30