If y varies directly with x and y = 3 when x = 12, then what is the value of y when x = 40?

4

160

10

480

3 answers

3 = 12/4
y=x/4, so ...

y=4?

huh? Huh???

y = x/4

when x=40, y = 40/4

Stop guessing and start calculating...

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