Building Blocks
Solution
Ariel and Ling used 3,364 plastic blocks.
Explanation
First: Find out how many bags of each color they used. Look at the clues:
 They used 2 bags of the color with the most blocks in the bag.
(2 bags of red)
 They used 4 bags of the color with the least in the bag.
(4 bags of blue)
 They used 3 more bags of yellow than of red.
(3 + 2 = 5; 5 bags of yellow)
 They used 3 bags of the other color.
(3 bags of green)
Second: Find out how many blocks of each color they used.
This chart shows how many in each bag and how many bags of each color were used. Multiply to find the total number of blocks of each color used.
Color 
Red 
Blue 
Green 
Yellow 
How many bags used 
2 
4 
3 
5 
Multiply 
4 
0 
7 
x 

2 

8 
1 
4 

1 
4 
3 
x 

4 

5 
7 
2 

3 
0 
6 
x 

3 

9 
1 
8 


2 
1 
2 
x 


5 

1, 
0 
6 
0 

Total for each color 
814 
572 
918 
1,060 
Third: Add the number of blocks for each color to find out how many blocks were used in all.
Add
814 
572 
918 
+ 1,060 

3,364 
Ariel and Ling used 3,364 plastic blocks.