Magic Algebra

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT




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A research team went to a village somewhere between the jungles of Africa. Luckily for them, they reached the day when quite an interesting custom was to be performed. The custom was performed once a year as they confirmed and was performed in order to collect the taxes from every male of the region.

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What four weights can be used to balance from 1 to 30 pounds?

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Five lovely ladies(Sophia, Isabella, Madison, Emma and Olivia) planned a picnic.

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Three kids
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Bill: Not bad, got married and I have three kids now.
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Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jack: Cool..But I still don't know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh, now I get it.

How old are Bill's kids?

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There is a box full of marbles,
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In Canada, a mathematical puzzle must be solved in order to win the lottery to classify it as a “game of skill” not gambling.