Q3-4C - Buổi 19

Max, Peter, Anna all grow fruits. Peter grows strawberries, Anna grows apples, and Max grows oranges. Peter wants to exchange his strawberries for both oranges and apples. At least, how many strawberries does Peter exchange in order to get 3 apples and 2 oranges?

• 20

• 22

• 24

• 26

• 28

To cook an elixir a witch needs five types of herbs exactly in the amounts weighed by the scales in the picture. The witch knows that she needs to put 5 grams of sage into the elixir. How many grams of hibiscus does she have to use? (The weight of the scales is irrevelant.)

• 50 g

• 40 g

• 30 g

• 20 g

• 10 g

The six weights of a scale weigh 1 kg, 2 kg, 3 kg, 4 kg, 5 kg and 6 kg. Rosi places five weights on the two scale pans so that they are balanced. The sixth weight is left aside. Which weight is left aside?

• 1 kg

• 2 kg

• 3 kg

• 4 kg

• 5 kg

3 similar apples and 5 similar oranges have a mass of 270 g. 3 such apples and 7 such oranges have a mass of 342 g. What was the mass of one orange?

• 72 g

• 60 g

• 36 g

• 30 g

• 15 g

Four balls each weigh 10 g, 20 g, 30 g and 40 g. Which ball weighs 30 grams?

• A

• B

• C

• D

• it could be A or B

Martin placed 3 different types of objects, hexagons, squares and triangles on sets of scales, as shown in the figure. What does he need to put on the left-hand side on the third set of scales for these scales to balance?

• 1 square

• 2 squares

• 1 hexagon

• 1 triangle

• 2 triangles

Which number can Michael add on the center so that the sums of numbers on circles on the same straight line are equal?

• 1, 2 or 3

• 4 or 7

• 1, 4 or 6

• 7

• 1, 5 or 9

He wants to write the numbers 1, 2, 3, 4 and 5 in the remaining circles so that the sum of the numbers along each side of the square is 13. What will be the sum of the numbers in the grey circles?

• 12

• 13

• 14

• 15

• 16

Which number is placed in the shaded square?

• 4

• 5

• 6

• 7

• 8

Which number does Mosif have to change?

• 1

• 3

• one of the two 4s

• 5

• one of the two 7s