Q&A - PSLE Math

[tianzhu]

Hi


Use \"Work backwards\"

Hope this helps.

Best wishes

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[Michaelia0816]

Hello everyone! I need help, I am not sure of this question. I need step by step answer!

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A shopkeeper had two DVD players of the same model. He sold one of them at 40% more than the usual price and the other at 10% less than the usual price. He received a total of $330. What was the usual price of each DVD player?

[Michaelia0816]

The answer sheet said it was $150. Was it right?

[Michaelia0816]

Sorry as my teacher printed the question with the final answer beside it so I don know the statements and method!!!

[tianzhu]

Michaelia0816:

The answer sheet said it was $150. Was it right?

Hi

If answer is given as 150

150*0.9 ----- 135
150*1.4 ----- 210

Total sum ----- 345 and not 330.

If it is \"20% less than the usual price\", then 150 is correct.

Please check with your teacher.

Best wishes

[Michaelia0816]

Thank Tianzhu!

[Michaelia0816]

Again Tianzhu, another question.

4. Jason left Town A for Town B. After travelling 5/8 of the distance, he passed Mary who was travelling in the same direction at a constant speed of 50km/h. It took Jason 2 hours to complete the remaining journey. When Jason reached Town B, Mary was still 80km away from Town B.
A) What is the distance between Town A and Town B?
B) What was Jason’s average speed?

[tianzhu]

Michaelia0816:

Again Tianzhu, another question.

4. Jason left Town A for Town B. After travelling 5/8 of the distance, he passed Mary who was travelling in the same direction at a constant speed of 50km/h. It took Jason 2 hours to complete the remaining journey. When Jason reached Town B, Mary was still 80km away from Town B.
A) What is the distance between Town A and Town B?
B) What was Jason's average speed?

Hi

Start with a simple diagram.

In 2h, Mary covered 2*50 or 100km

100 + 80 ----- 180

3/8 of journey or 3 units ----- 180

1 unit ------ 60

Distance ------- 8*60 -------480 (Distance between A and B)

Jason average speed ------- 180/2 ------ 90km/h

Best wishes

[Michaelia0816]

Thank again, I had to admit I didn’t think of that method to comple yeh.

[tianzhu]

Michaelia0816:

Thank again, I had to admit I didn't think of that method to comple yeh.

Hi

You're welcome.

You are a smart young lady.You'll get better.

Best wishes