21 P5.ST.JC.18121191
Level 2
There are 4 girls and 5 boys.
The average height of the 4 girls is 155 cm.
The average height of 5 boys is 164 cm.
What is the average height of all the children?
2 m
2 averages
22 P5.ST.JC.18121198
Level 2
The average height of 4 girls is 100 cm.
The average height of 5 girls is 110 cm.
Find the height of the fifth girl.
2 m
2 averages
23 P6.SP.TL.18012223
Level 2
A driver drives a distance of 8 km in 10 minutes.
  1. What was his speed in km/h?
  2. Driving at this speed, how long will it take him to cover 80 km? Answer in mixed number.
2 m
DST triangle Average speed Unit conversion Duration
24 P5.DA.NK.23052601
Level 2
The graph shows the earnings that an apparel store made from January to May.
  1. What was the total earnings from January to May?
  2. How much money must be earned in June to have an average earnings of $3200 from January to June?
2 m
Bar graph Average Money Time More than or less than
25 P5.ST.JC.18121199
Level 3
There are 4 girls and some boys.
The total height of the children is 1440 cm.
The average height of the 4 girls is 155 cm.
The average height of the boys is 164cm.
How many boys are there?
3 m
2 averages
26 P6.SP.TL.18012202
Level 2
A train left for City Z at 07 00. The train stopped over at City S for half an hour before continuing its journey to City Z. It reached City Z at 13 45. If the average speed of the train was 350 km/h, what was the total distance covered by the train?
2 m
DST triangle Average speed Duration Start end time
27 P5.ST.JC.18121192
Level 2
The average cost of 5 books is $30.
After another book that costs $90 is added,
  1. What is new total cost of all the books?
  2. What is new average cost of all the books?
3 m
Averaging out
28 P5.ST.JC.18121193
Level 2
The average cost of 5 books is $30.
After a book that costs $60 is removed,
  1. What is new total cost of all the remaining books?
  2. What is new average cost of all the remaining books?
3 m
2 averages Averaging out
29 P6.SP.JC.21061113
Level 1 PSLE
Raymond started walking from home at 7.50 a.m. to the market, which was 1200 m away. He walked at 75 m/min. At what time did he reach the market?
2 m
DST triangle Average speed Duration Start end time
30 P5.ST.JC.18121194
Level 2
The average cost of 5 books is $30.
After 2 books are removed,
the average cost of the remaining books is $20.
  1. What is the total cost of the 2 books that are removed?
  2. What is the average cost of the 2 books that are removed?
3 m
2 averages Averaging out

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