6 - 11 year olds

In Cristmas time, a children’s shop has surrounded some toys in a cercle with color bulbs.

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a) One circle has 14 bulbs. The blue colour keeps on jumping the whole day from one bulb into 4 positions ahead.

How many bulbs are visited by blue colour?

Hint: A circle is closed and the blue colour keeps on jumping for the whole day.

It may be useful to solve this task if you number every position in the circle: 1, 2, 3, 4, ... till 14.

b) Another circle has 8 bulbs. The yellow colour keeps on jumping from one bulb into 3 positions ahead. How many bulbs are visited by the yellow colour?