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Read the posting on Fatimah and Hairu play Congkak to know about Congkak game.
Read also the posting on Sarin learns Average Number, Percentage and Charting in school (Math Concept) to know about Pie Chart.
You should also read the posting on Sarin learns concept of ratio in school to understand mathematics concept of Ratio.
Challenge yourself with the question before look for the given solution‼!
Upper primary school mathematics question UPQ279
Fatimah uses some green, red and blue marbles in the Congkak game. She has 25% more green marbles than red marbles, and 20% less blue marbles than green and red marbles.
(a) What is the ratio of red marbles to green marbles to blue marbles?
(b) If there are 11 more blue marbles than green marbles, how many red and green marbles are there?
Draw the ratio model and subdivided to 10 divisions per blocks.
Green and red marbles are 90 units
Blue marbles = 90 × 80% = 72 units
The ratio of marbles, R : G : B = 40 : 50 : 72 = 20 : 25 : 36
There are 11 more blue marbles than green marbles
(36 – 25) = 11 units = 11
1 unit = 1 marble
The number of red and green marbles = 20 + 25 = 45
25% more green marbles than red marbles
The ratio of marbles
G : R = 1.25 : 1 = 5 : 4
G : R : (G + R) = 5 : 4 : 9 = 25 : 20 : 45
20% less blue marbles than green and red marbles
B : (R + G ) = 0.8 : 1 = 4 : 5 = 36 : 45
There are same amount of Green and Red marbles.
The ratio of marbles,
R : G : B = 20 : 25 : 36
11 units = 11
1 unit = 1 marble
The red and green marbles = 20 + 25 = 45