Question

Ron solved the equation (2/3)r = 12 by multiplying both sides by 2/3 and he got r = 8. Explain the error that Ron made and then find the correct value for r

Answer 1

Ron multiplied with the wrong number. He should have multiplied with 3/2 (the reciprocal of 2/3), which would have made the 2/3 a 1, thus isolating the r.

r = 18

Explanation:

(2/3)(3/2)r = 12

r = 12(3/2)

r = 18