Question

Tadek has as much as witek and karol have together. Witek has 10 zloty (unit of money) less than karol. The three boys have 40 zloty altogether. How many money does witek have?

Answer 1

• Witek has 5 zloty

Explanation:

Tadek has as much as the other two together, so has half the total. The other 20 zloty is split so Witek has 10 zloty less than Karol. If w represents the amount Witek has, then (20-w) is the amount Karol has, and the difference is ...

(20-w) -w = 10

10 = 2w . . . . . . . . add 2w-10

5 = w . . . . . . . . . . divide by 2

Witek has 5 zloty.