When measuring distance 12 beads are Approxmately equal to 6 erasers. How many erasers are equal to 18 beads? How many beads equal to 42 erasers?

Answer 1

use a simple ratio

for the first:

12/6 = 18/x
cross-multiply
12x = 108
x = 9

repeat for the second part

or

simply realize that one eraser is twice as long as a bead, so ....