FOR CHILDREN

PROBLEM # 1
There is a number that is 2  times the sum of its digits. What is this number?

FOR GROWNUPS

PROBLEM # 2
In Figure 1, a cylinder 75 cm high has a circumference of 20 cm. A string makes exactly 5 complete turns round the cylinder while its two ends touch the cylinder's top and bottom. How long is the string in cm?
(do not worry that the figure shows only four complete turns)

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SOLUTIONS TO PROBLEMS ON 04/06/06

FOR CHILDREN

PROBLEM # 1
Two dice are thrown, what is the probability that there is at least one 4 showing?

SOLUTION
11/36.

FOR GROWNUPS

PROBLEM # 2
In Figure 2, the rectangle at the corner measures 2 cm x 4 cm. What is the radius of the circle in cm?

SOLUTION
10 cm.

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