Questions

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36 P4.DE.JM.171010128

Level 3
The number of 20-cent coins in a box is as many as the number of $1-dollar coins. The total value of the coins is $26.40.

Find the total number of coins in the box.
Find the total value of 20-cent coins in the box.

3 m

Attempt

37 P5.PC.JC.17083141

Level 3
There was an equal number of tables and chairs in the morning. At noon, some tables were added and some chairs were removed, resulting in the number of tables being increased by 20% while the number of chairs decreased by 30%. At 7 p.m. the number of tables increased by 50%. If a total of 32 tables were added during the day, how many more tables than chairs were there in the end?

4 m

Attempt

Percent change by Percent of different bases Equal stage before Unchanged quantity All change Units table Decimal units

38 P5.DA.JM.17083156

Level 3
Lizzy bought some souvenirs for her friends at an average price of $12.50. If Lizzy decided to buy a pen which cost $16 for her father and a bag which cost $35 for her mother, the average price of the souvenirs would become $15.75. How many souvenirs did Lizzy buy for her friends?

3 m

Video Attempt

2 Averages Averaging out Average with unknown quantity Money Number x value Units equations Units table Decimal units

39 P6.PC.TL.16010145

Level 3
If Yvonne gives Oscar $27, the amount of money she has will be 25% of his. If Oscar gives Yvonne $12, he will have the same amount of money as her. How much money did each of them have?
(a) Oscar
(b) Yvonne

4 m

Attempt

Percent to units Money Equal stage after Internal transfer Unchanged total Double if Units table Decimal units

40 P5.RD.JM.17083262

Level 3
Mr Lim had three bags of soil, A, B and C and the mass of each bag of soil was in the ratio 2 : 4 : 3. Mr Lim decided to transfer 30% of soil from Bag A into Bag B and 60% of soil from Bag C into Bag B. Given that the mass of Bag B was 38.4 kg in the end, how many kilograms of soil were transferred into Bag B?

5 m

Attempt