Tutor MathsGuru: Ask me for your burning Maths questions!

[MathIzzzFun]

Andrew Lee:

Hi, Can help me solve this question ?

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Hi

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cheers.

[MathIzzzFun]

Andrew Lee:

Hi, can help me solve this headpain question http://i53.tinypic.com/33lp8jp.jpg\">

Hi

Total 77 cuboids.

First fill up to 8cm in height, this will yield 7 x 2 x 4 = 56 cuboids

The remaining space of 14cm x 6 cm x 3 cm will yield 7 x 3 x 1 = 21 cuboids.

So, total = 56 + 21 = 77 cuboids.

cheers.

[imacsg]

Can anyone help?


Michael bought some apple and gave half of them to Jackson.
Jackson bought some pears and gave half of them to Michael.
Michael threw away 25 pears that were rotten while Jackson bought for himself another 20 apples.
After that, the number of pears to apple Michael had were in the ratio of 1:4 and the number of pears to apples Jackson had were in the ratio of 1:2.
How many pears did Jackson buy?

Ans : 80.

Thanks.

[andante]

Hi


Total 77 cuboids.

First fill up to 8cm in height, this will yield 7 x 2 x 4 = 56 cuboids

The remaining space of 14cm x 6 cm x 3 cm will yield 7 x 3 x 1 = 21 cuboids.

So, total = 56 + 21 = 77 cuboids.

cheers.[/quote]

Sorry to ask how you know that you should fill up to 8cm in height but not to 10cm in height ? Is there any way or trial and error to find out the maximum ?

[MathIzzzFun]

imacsg:

Can anyone help?


Michael bought some apple and gave half of them to Jackson.
Jackson bought some pears and gave half of them to Michael.
Michael threw away 25 pears that were rotten while Jackson bought for himself another 20 apples.
After that, the number of pears to apple Michael had were in the ratio of 1:4 and the number of pears to apples Jackson had were in the ratio of 1:2.
How many pears did Jackson buy?

Ans : 80.

Thanks.

Hi

http://www.flickr.com/photos/62167097@N02/5932660565/in/photostream

cheers.

[MathIzzzFun]

andante:

Hi


Total 77 cuboids.

First fill up to 8cm in height, this will yield 7 x 2 x 4 = 56 cuboids

The remaining space of 14cm x 6 cm x 3 cm will yield 7 x 3 x 1 = 21 cuboids.

So, total = 56 + 21 = 77 cuboids.

cheers.

Sorry to ask how you know that you should fill up to 8cm in height but not to 10cm in height ? Is there any way or trial and error to find out the maximum ?[/quote]

Hi

There is no fixed formula, if that's what you are looking for. In general, try look for two different ways to cut /fill the block:1st way- fill 10 cm, 2nd way-fill 3cm side along the 11cm side, yielding 7 x 3 x 3 cuboids = 63 cuboids and leaving a volume of 14 cm x 6 cm x 2 cm which can yield another 7 x 2 x1 = 14 cuboids making a total of 77 cuboids (this is another way to yield 77 cuboids).

cheers.

[Andrew Lee]

Hi,


When a pebble is dropped into a pool of water, circular ripples are formed 2 consecutive ripples have a radius of 7cm and 14cm respectively. What is the percentage increase in the area of the ripples?

[Andrew Lee]

Hi,


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[leeven]

anybody can post 2011 NMOS special round Question & Answers

[K mum]

Please help me to solve these problem sum:


1.Ali has six times as many marble as Norman. The ratio of the number of Norman’s marbles to the number of Ray’s marbles is 5: 3. Find the ratio of the number of Ali’s marbles to the number of Ray’s marbles.

2. A box contained some green pens and blue pens in the ration 7 : 2. After removing 22 green pens and putting in 18 blue pens, there is now an equal number of green and blue pens in the box. How many green pens were in the box at first ?

3.The ratio of the number of soccer balls to that of basketballs in a storeroom was 2 : 3. When another 144 balls were put into the storeroom, there were twice as many soccer balls and thrice as many basketballs. How many soccer balls & basketballs were there in the storeroom originally ?