Q&A - PSLE Math

[MathIzzzFun]

Belle2011:

At 9am, John was cycling from Point A to Point B. At the same time, Mary was cycling from Point B to Point A using the same route as John. Cycling at a speed of 4km/h faster than Mary, they would pass each other 300m away from the midpoint.

(a) What time did they pass each other?
(b) If John took another 3 minutes to reach Point B, what time would Mary reach Point A?

For (a), I got 4.5 min.
Is this answer correct?

I do not know how to do (b).

Thank-you.

Cheers,
Belle.

Hi

this was discussed in an earlier thread - http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=27&t=280&start=3470

cheers.

[Dreamerz]

Thank you tianzhu

[tianzhu]

Dreamerz:

Thank you tianzhu

Hi Dreamerz

Good Morning.

You’re welcome.

Best wishes

[tianzhu]

stary:

Thanks tianzhu!

Cheerio!!!

Hi stary

GoodMorning.

You’re welcome.

Best wishes

[Super Alice]

Hope some one can help on the following question:


The cost of 3 mangoes is the same as the cost of 5 gapefruits. The cost of 3 mangoes is also the same as the cost of 10 pears. Find the ratio of the cost of a mango to the cost of a grapefruit to the cost of a pear.


Pls help to show steps to get the ratio. Thanks.

[tianzhu]

Super Alice:

The cost of 3 mangoes is the same as the cost of 5 gapefruits. The cost of 3 mangoes is also the same as the cost of 10 pears. Find the ratio of the cost of a mango to the cost of a grapefruit to the cost of a pear.

Hi

You may use MD.

Use a common multiple of 30 (3,5 and 10).

A mango ---- 10 units
A grapefruit ------ 6 units
A pear ----- 3 units.

The answer is 10:6:3

Best wishes

[Super Alice]

tianzhu:

Super Alice:

The cost of 3 mangoes is the same as the cost of 5 gapefruits. The cost of 3 mangoes is also the same as the cost of 10 pears. Find the ratio of the cost of a mango to the cost of a grapefruit to the cost of a pear.

Hi

You may use MD.

Use a common multiple of 30 (3,5 and 10).

A mango ---- 10 units
A grapefruit ------ 6 units
A pear ----- 3 units.

The answer is 10:6:3

Best wishes

Noted. Thanks...

[stary]

Hi all, have a question to ask...


Two runners, Tom and Peter, were training on a 400-metres circular track. They started running in the same direction from the same place at the same time. The average speed of Tom was 1.2m/sec while Peter was running at 1.8m/sec. How long, in minutes, did Tom take to meet Peter the second time after they started running? Express your answers in a mixed fraction.

http://www.flickr.com/photos/64113082@N03/6045335566/in/photostream

[blitz]

PLs assist.

Belinda has 20% more stickers than Yi Xizng. Yi Xiang has 25% more stickers than Sabrina.
(a)What is the ratio of Belinda’s stickers to Sabrina stickers?
(b)Yi Xiang gave some stickers to Sabrina so tha they each had the same number of stickers. Now Belinda has 36 more stickers than Sabrina. How many stickers does Belinda have?

[blitz]

One more question…thanks in advance


60% of people at a performance were adults. 75% of the children at the performance were girls. There were 36 more girls than boys. Halfway thru the performance, some girls left. After that, 2/9 of the remaining people were girls.

How many girls left the performance?