Tutor MathsGuru: Ask me for your burning Maths questions!

[starlight1968sg]

CJM:

hi all, pls help with this question :


A large water tank has two inlet pipes ( a large one and a small one ) and one outlet pipe. it takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 4 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 7 hours.

What fraction of the tank ( initially empty ) will be filled in 2.27 hours if all three pipes are in operation? Give your answer to two decimal places.

Is the ans in fraction or decimal corrected to 2 dec pl?
What is the ans?

[MOE Hater]

CJM:

hi all, pls help with this question :


A large water tank has two inlet pipes ( a large one and a small one ) and one outlet pipe. it takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 4 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 7 hours.

What fraction of the tank ( initially empty ) will be filled in 2.27 hours if all three pipes are in operation? Give your answer to two decimal places.

I don't understand. You asked for a fraction then said to give the answer to 2 decimal places

[kancheongmum]

Almighty:

Dharma:

[quote=\"kancheongmum\"]Hi Dharma how do you get the answer 126 cm2. Looking at the fig I think is 120 cm2. Pls adv if I am wrong

Thanks Dharma and others!!

[/quote]Hi Dharma and Maths6a, sorry I realised my mistake after posting got the same working as Dharma.
thanks very much Dharma and tianzhu your solutions on all question are very helpful.

[kancheongmum]

tianzhu:

Hi clblinym


You're welcome.

Best wishes

Hi tianzhu really like your graphics in your answers. I hope you don't mind explaining to me on the solution of sheep eating grass again. I don't quite get it thank very much.

[maths6a]

MOE Hater:

CJM:

hi all, pls help with this question :


A large water tank has two inlet pipes ( a large one and a small one ) and one outlet pipe. it takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 4 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 7 hours.

What fraction of the tank ( initially empty ) will be filled in 2.27 hours if all three pipes are in operation? Give your answer to two decimal places.

I don't understand. You asked for a fraction then said to give the answer to 2 decimal places

Sorry I worked answer to be 0.999 so rounded up will be 1.00 which is like whole tank is filled???

[MOE Hater]

maths6a:

MOE Hater:

[quote=\"CJM\"]hi all, pls help with this question :


A large water tank has two inlet pipes ( a large one and a small one ) and one outlet pipe. it takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 4 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 7 hours.

What fraction of the tank ( initially empty ) will be filled in 2.27 hours if all three pipes are in operation? Give your answer to two decimal places.

I don't understand. You asked for a fraction then said to give the answer to 2 decimal places

Sorry I worked answer to be 0.999 so rounded up will be 1.00 which is like whole tank is filled???[/quote]Me too! Fraction is 8399/8400

[starlight1968sg]

My ans is almost 1 tank, after rounding off.

[starlight1968sg]

repeated post

[biscuitqueen]

mathsguru:

biscuitqueen:

Hi there, please help me solve this Maths questn for my daughter.

I have no idea how to solve. Thanx!

Mary and Ken travelled from Town A to Town B. Mary left Town A at 0915 and took 4h to reach Town B. Ken left Town A at 1000 and took 2h 45min to reach Town B. At what time did Ken pass Mary?

Hi Biscuitqueen,

Here's my solution. Hope it helps!

Cheers,
MathsGuru

http://www.postimage.org/image.php?v=gxbp40J

Hi There! Thanx so much for your solution. I need to study it carefully. But it is clear and very helpful. Thank you again!

[tianzhu]

kancheongmum:

I hope you don't mind explaining to me on the solution of sheep eating grass again.

Hi kancheongmum

I used 1 unit to represent the amount of grass eaten by one sheep per day to simplify the calculation.

First find the amount of grass eaten by 200 sheep and 150 sheep. Then determine the rate of growth of grass.

After this, find the size of the original pasture. 100 sheep eat 100u of grass every day and the growth rate of grass per day is 50u.Therefore 15000u/(100u-50u) --- 300days.

Hope this helps.

Best wishes