41 P6.AG.JC.17080424
Level 2
The average mass of Lynn and Joan is 18p kg. If Joan is 4p kg lighter than Lynn, find Lynn's mass in kg.
2 m
Algebra in 1 variable Algebra simplifying Mass Average More than or less than Units method
42 P5.DA.JM.17083186
Level 1
In 8 years' time, the average age of Mr Tong and his son will be 27 years. What is their total age now?
2 m
Average
43 P6.SP.TL.18012205
Level 2
A train travelled 900 km from City A to City B at an average speed of 150 km/h. It then travelled 500 km to City C at an average speed of 120 km/h. Find the time taken for the whole journey. Express the answer in h and min.
2 m
DST triangle Average speed Journey by parts Different speed Duration
44 P5.ST.JC.18121202
Level 3
The average cost of some books is $75.
When another 3 books are added,
the total cost increases by $190.
The average cost becomes $70.
How many books are there in the end?
3 m
2 averages Averaging out Average with unknown quantity Number x value Units equations Units table
45 P6.ME.JC.22050604
Level 2 PSLE
A group of 5 girls booked a tennis court for 3 hours and took turns to play. At any time, there were 4 girls playing on the court. On average, how long did each girl play on the court? Give the answer in hours and minutes.
2 m
Unit conversion Duration Units method
46 P5.DA.JC.17100325
Level 1
Tom is 72 kg. Alice's mass is 79 of Tom's mass. What is their average mass?
2 m
Average F Multiplication Fraction of a whole Mass
47 P6.SP.TL.18012206
Level 2
A race car travelled 25 of its journey at an average speed of 64 km/h. Find its average speed for the remaining 480 km if its average speed for the whole journey was 80 km/h.
2 m
DST triangle Average speed Journey by parts Different speed Fraction of a whole Units method
48 P5.ST.JC.18121203
Level 3
The average cost of some books is $30.
When a book that costs $90 is added,
the average cost of the books becomes $40.
How many books are there in the end?
3 m
2 averages Averaging out Average with unknown quantity Number x value Units equations Units table
49 P5.DA.JM.17083164
Level 1
What is the average of the first 5 odd numbers?
2 m
Average Odd & even
50 P6.SP.TL.18012207
Level 2
An airplane flew 9000 km from Country X to Country Y at a speed of 450 km/h. It then covered 4900 km from Country Y to Country Z at a speed of 350 km/h. Find the time taken for the whole journey.
2 m
DST triangle Average speed Journey by parts Different speed Duration

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