Level 2
The total cost of a watch, a radio and a calculator is $270. The radio costs thrice as much as the calculator. The watch costs twice as much as the radio. Find the difference in the cost between the watch and the radio.
Level 2
There are 180 blue and green balls in bag A. There are 320 green and red balls in bag B. Given that there are thrice as many red balls as blue balls, and the number of green balls in both bags is the same, find the difference between the red balls and the blue balls.
Level 3
A farmer had twice as many chickens as ducks. After he had sold 200 chickens, he had thrice as many ducks as chickens. How many chickens did he have at first?
Level 3
Harold has 348 lollipops and Eli has 712 lollipops. How many lollipops must Eli give to Harold so that Harold will have thrice as many lollipops as Eli?
