Question

Please help!! Sally has $4.60 change in her pocket. she has only 20 cents and 50 cent coins, 14 coins in total. If t is the number of 20c coins that sally has, find t.

Answer 1

8

Explanation:

4.60=0.2t+0.5f

t=20 cent coins

f=fifty cent coins

t+f=14

multiply the second equation by 0.5 to eliminate the f and subtract one equation from another.

4.60=0.2t+0.5f

-(7 =0.5t+0.5f)

-------------------------------

-2.4= -0.3t

multiply both sides by -0.3 to get 8=t. That's the # of 20 cent coins.