Question

If r = 5 z then 15 z = 3 y, then r =

(A) y
(B) 2 y
(C) 5 y
(D) 10 y

Answer 1

r = 5z
?r = 15z
?r = 15z = 3y

Answer 2

please explain.

Answer 3

@frx can you please solve this?

Answer 4

One min..

Answer 5

It's A. let me explain

Answer 6

You got \[r=5z; 15 z=3y\]

Answer 7

So what you wanna find is what r is in terms of y

Answer 8

r=5z and 15z=3y so the conclution from that is that 5z is 1/3 of 15z, right?

Answer 9

That means that r=5z=y

Answer 10

so final answer is "A"?

Answer 11

Another formulation: you know that 15z=3y and you want to find 5z

Answer 12

Exactly

Answer 13

Do you get it? :)

Answer 14

You can also set it as an equationsystem

Answer 15

yeap got it. thank you.

Answer 16

np

Answer 17

\[r=5z \]
\[z=\frac{r}{ 5 }\]
\[15z=3y\]
\[15\frac{ r }{5 }=3y\]
\[3r=3y\]
\[r=y\]