Balloons are sold in packs of 5, 10 and 25. Marius buys exactly 70 balloons. What is the smallest number of packs he could buy ?

Bob folded a piece of paper. He drilled exactly one hole in the paper. The he unfolded the piece of paper and saw the result as shown in the picture.

How had Bob folded his piece of paper ?

There is a tournament at the pool. First 13 children signed up and then another 19 signed up. Six teams with an equal number of players are needed for the tournament. At least how many more children need to sign up so that the six teams can be formed ?

The Modern Sofa Furniture store is selling a sofa and a loveseat made from identical modular pieces as shown in the picture.

The width, including the seating and the armrests, is given below each item. How wide is an armrest ?

David wants to cook 5 dishes on a stove with only 2 burners. The times needed to cook the 5 dishes are 40 min, 15 min, 35 min, 10 min and 45 min. What is the shortest time in which he can do it ? ( Once he starts cooking a dish, he may remove it from the stove only when it is cooked )

A mathematical test consists of 20 problems. At the beginning, everybody starts with 20 points. For a correct answer one gets 1 point, while for an incorrect or missing answer 1 point is subtracted. Mary’s final result is 24 points. How many correct answers did Mary have ?

Identical cubes are glued together. The figures below show the structures seen from the front, from the left, and from above.

What number of cubes does the structure contain ?

Một quầy bán hàng có 48 gói kẹo gồm loại 0,5kg; loại 0,2kg và loại 0,1kg. Khối lượng cả 48 gói là 9kg. Hỏi mỗi loại có bao nhiêu gói (biết số gói 0,1kg gấp 3 lần số gói 0,2 kg) ?

Một người bán hàng đã thu được 110 tờ tiền gồm 3 loại mệnh giá là 5 đô la, 2 đô la và 1 đô la. Tổng giá trị của số tiền là 250 đô la. Trong đó số tờ 2 đô la gấp đôi số tờ 1 đô la. Hỏi mỗi loại tiền đó có bao nhiêu tờ?

Có 145 tờ tiền mệnh giá 5000 đồng , 2000 đồng  và 1000 đồng. Số tiền của 145 tờ tiền giấy trên là 312000 đồng. Số tiền loại mệnh giá 2000 đồng gấp đôi loại 1000 đồng . Hỏi mỗi loại tiền có mấy tờ ?

Ten bags each contain a different number of candies from one to ten. Five boys each took two bags of candies. Alex got five candies, Bob got seven candies, Charles got nine, and Dennis got fifteen. How many candies did Eric get ?

George starts training at five in the afternoon. The walk from hí house to the bus stop takes 5 minutes. The bus journey takes 15 minutes. It takes George 5 minutes to walk from the bus stop to the field. The bus arrives to his stop every 10 minutes from six in the morning. At what time at ther latest does George have to leave his house to arrive at the field exactly on time ?

A small zoo has a giraffe, an elephant, a lion and a turtle. Susan wants to plan a tour where she sees exactly two different animals. She does not want to start with the lion. How many different tours can she plan ?

Zosia has hidden smileys  in some of the cells of the table. In some of the other cells she writes the number of smileys in the neighbouring cells as shown in the picture. Two cells are said to be neighbouring if they share a common side or a common corner. How many smileys has she hidden ?

Kate has 4 flowers, one with 6 petals, one with 7 petals, one with 8 petals and one with 11 petals.

Kate choose three flowers and tears off one petal from each flower. She does this several times, choosing any three flowers each time. She stops when she can no longer tear one petal from three flowers. What is the smallest number of petals which can remain ?

In how many ways can Josie cut out a T-shape like   with exactly one shaded cell from the rectangle in the figure below ?

Ann has seven cards with letters as shown in the picture

Which other card does she need in order to make the word KANGAROO ?

In Ryan’s yard rabbits and squirrels left tracks in the show.

How many animals were there if each animal only walked through once ?

How many triangle are there in the picture ?

Find the missing part of the house ?

Five ladybugs live on a bush. How many spots, in total, do the ladybugs have ?

Eric had ten equal metal strips

He crewed pairs of them together into five long strips as shown below

Which strip is the shortest ?

Which of the scarecrows has a pointy hat, a checkered shirt, and three patches on its pants ?

Marko has 9 candies and Tomo has 17 candies. How many candies does Tomo need to give to Marko so that each boy will have the same number of candies ?

Don made two bricks by sticking cubes together as shown below

Which structure could not be built using the two bricks ?