Q&A - PSLE Math

[anneshirleygilbert]

Can somebody please help with this question?


Betina spent $20 on some stickers and bookmarks. She bought 6 times as many stickers as bookmarks. Each bookmark cost 30 cents more than a sticker. She spent $4 more on the stickers than on the bookmarks. What was the cost of a bookmark?

TIA.

[tianzhu]

anneshirleygilbert:

Can somebody please help with this question?


Betina spent $20 on some stickers and bookmarks. She bought 6 times as many stickers as bookmarks. Each bookmark cost 30 cents more than a sticker. She spent $4 more on the stickers than on the bookmarks. What was the cost of a bookmark?

TIA.

Hi

Amount spent on stickers ------ 12
Amount spent on bookmarks ------- 8

She bought 6 times as many stickers as bookmarks.

Bookmarks ------ 1 unit
Stickers ------- 6 units

Hence, 1 unit of stickers ------- 12/6 ------- 2

1 unit of bookmarks ------- 8

There is an extra of 6 (8-2) because the bookmark costs 30 cents more than a sticker.

Number of bookmarks ------- 600/30 ------ 20

Therefore cost of 1 bookmark -------- 800/20 ------- 40 cents.

Check

120*10 ------- 1200
20*40 ------ 800

Best wishes

[anneshirleygilbert]

Thanks alot, tianzhu. Forgot that we should compare one unit of bookmark with one unit of stickers so we can make use of the difference of $0.30 to find out how many bookmarks there are in 1 unit.


Many thanks, indeed. Have a good weekend!

[tianzhu]

anneshirleygilbert:

Thanks alot, tianzhu. Forgot that we should compare one unit of bookmark with one unit of stickers so we can make use of the difference of $0.30 to find out how many bookmarks there are in 1 unit.


Many thanks, indeed. Have a good weekend!

Hi

You are welcome.

Have a nice weekend too.

Best wishes

[tianzhu]

Hi


Another way of looking at this question.

Hope this helps.

Best wishes

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[mlim321]

Need help on this question:


There were some pens and pencils in a box. When Ali took out 24 pencils, there are 5 times as many pens as pencils left. If he had taken out 60% of the pens from the box instead, he would have twice as many pencils as pens left. How many pens were in the bo at first?

TIA!

[Essential]

Good nite Tian Zhu , I m back to seek for help. Please help us with this question. A car and a coach travelled from town A and town B. the coach left A at o648 and it took 5 hours to reach town b.the car started 30 mins later than the coach and it took 4 hours to reach town b. at what time did the car catch up with its coach

[Essential]

Good nite Tian Zhu , I m back to seek for help. Please help us with this question. A car and a coach travelled from town A and town B. the coach left A at o648 and it took 5 hours to reach town b.the car started 30 mins later than the coach and it took 4 hours to reach town b. at what time did the car catch up with its coach

[Essential]

Good nite Tian Zhu , I m back to seek for help. Please help us with this question. A car and a coach travelled from town A and town B. the coach left A at o648 and it took 5 hours to reach town b.the car started 30 mins later than the coach and it took 4 hours to reach town b. at what time did the car catch up with its coach

[MathIzzzFun]

mlim321:

Need help on this question:


There were some pens and pencils in a box. When Ali took out 24 pencils, there are 5 times as many pens as pencils left. If he had taken out 60% of the pens from the box instead, he would have twice as many pencils as pens left. How many pens were in the box at first?

TIA!

Hi
after Ali took out 24 pencils,
pens : pencils --> 5u : 1u

at first,
pens : pencils --> 5u : 1u + 24

If 60% of pens is taken out,
pens : pencils --> 2u : 1u + 24 = 1 : 2

cross-multiply/equalize,
4u = 1u + 24
1u --> 8

Number of pens in the box at first --> 5 x 8 = 40

cheers.