Question

bob can draw 14 shapes in 7 minutes. How long does it take for bob to draw 28 shapes at the same rate?

Answer 1

14/7 = 28/y

since 14 x 2 = 28, 7 x 2 = y

7 x 2 = 14

so, Bob will take 14 minutes to draw 28 shapes

Answer 2

if 14 shapes take 7 mins, let x be the time it takes to draw 28 shapes

7/14 = x/28

x = (7/14)(28)
   = 14 

Therefore, 28 shapes in 14 minutes.