A ratio problem

Question

Dave is playing with bricks.

He has 300 of each type of brick. The two spot, the four spot and the eight spot.

Dave uses these to make robots with two, four and eight spots to the ratio 3:1:2
When he finished he had twice as many four spots left as two spots

Work out how many eight spots are left

Answer 1

3x + x + 2x = 300

6x = 300

x = 50

 

150 : 50 : 100

 

Considering the ration given fours spots being twice two spots is impossible.