G5 Math Olympiad Part B

A bucket contains 1 red, 1 yellow, 1 blue and 1 white flower. Maja, the bee, visit every flower in the bucket only once. She start from the red flower, and she does not fly directly from the blue one to the yellow one. In how many ways can Maja visit all the flowers exactly once?

I added the first ten whole numbers greater than 0. I forgot to include one whole number and I got 50 as the sum. Which one of these ten whole numbers I did not add?

To complete the grid below, each of the digits from 1 to 4 must occur exactly once in each row and in each column. What number should replace X?

A farm has 30 chickens and rabbits altogether. There are only 100 legs. Find the number of rabbits in the farm.

A father is 50 years old. His son is 24 years old. How many years ago was the father’s age three times his son’s age?

Ali is making squares using matches. He made the next square by adding more matches to the previous square as shown in the picture below. How many matches does he have to add to the 5th square to build the 6th square?

When Tom weighed an apple and banana, the scale showed 230 grams. When he replaced the apple with an orange, the scale showed 370 grams. When Tom put the apple bac, the scale showed 540 grams. What is the combined weight of the apple and orange?

In a class, 14 students collect stamps, 16 students collect postcards, 5 students collect both and 4 students collect none of them. How many students are there in this class?

There were 60 birds on three trees. Then 6 birds flew away from the first tree, 8 birds flew away from the second tree and 4 birds flew away from the third tree. Now there are the same number of birds on each tree. How many birds were there on the second tree in the beginning?

Iqra is 10 years old. Her father Arman is currently 4 times as old as Iqra. How old will Arman be when Iqra is twice as old as she is now?