Tutor MathsGuru: Ask me for your burning Maths questions!

[mathsguru]

Herbie:

Hi I have a speed qn. Can help?


Town B is located between Town A and C.
At 2pm, a train left Town B and travelled towards Town C.
2.5 hr later, another train left Town B for Town A.
At 6pm, the two trains were 569km apart.
What was the speed of the train travelling towards Town C if it was going at 35km/h faster than the other train?

Tx

Hi Herbie,

Here's my solution!


MathsGuru

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[mathsguru]

WWong:

Newbies here, with ratio problem to solve, which goes this way as below:


The ratio of the number of daisies to the number of orchids in Basket A and Basket B are 2:1 and 2:7 respectively. Basket A has 2/3 times as many flowers as Basket B.

(a) Find the ratio of the number of daisies in Basket B to the number of daisies in Basket A.

(b) When 18 orchids are moved from Basket B to Basket A, the ratio of the number of daisies to the number of orchids in Basket A becomes 8:7. How many orchids are there in Basket A now?

Thanks.

Hi WWong,

Here's my solution!


MathsGuru

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[mathsguru]

mahan:

mina had 20% less hair clips than anne.caili had 20% more hair clips than mina.express caili's hair clips as a percentage of anne's hair clips

Hi Mahan,

Here's my solution!


MathsGuru

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[mathsguru]

mahan:

marina has 200 more books than ethel.marina gives 60% of his books to ethel.ethel then gives 25% of her books back to marina .in the end ,ethel has 200 more books than marina.how many books does marina have at first?

Hi Mahan,

Here's my solution!


MathsGuru

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[mathsguru]

talk_aboutstudies:

Is there a method where i can solve all speed questions like this:


A car and a van were travelling in opposite directions at speeds of 80km/h and 60km/h respectively. The car was travelling from Town A to Town B while the Van was travelling form Town B to Town A. At what time would the pass each other?


Note: No distance is given

Please help!

Hi talk_aboutstudies,

Here's my solution!


MathsGuru

http://www.postimage.org/image.php?v=aVIG8tr

[mathsguru]

Lynn1967:

This is 2008 RGS SA1 qn. Anyone has the answers as I have misplaced it.


Many thanks.

At 9am, a van left Town P for Town Q. After some time, a car left Town Q for Town P. The 2 vehicles met at 11.30am. The ratio of the speed of the van to the speed of the car is 3:5.

a) What time did the car leave Town Q?
b) If the distance between Town P and Town Q is 150km, calculate the average speed of the van.

Hi Lynn1967,

Here's my solution!


MathsGuru

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[mathsguru]

ruyu:

Suzy bought 12 stickers from Singapura Bookshop. The price of each sticker was the same. If the price of 1 sticker was cheaper by 5-cents, she could have bought4 more stickers at the cheaper price. How much did she spend on 12 stickers?

Hi Ruyu,

Here's my solution!


MathsGuru

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[mathsguru]

zyberk:

Hi,


Appreciate if you can help with this question:

A snail is climbing up a wall 20m high. Everyday it climbs up 5m, and slips down 2m at night. How many days will it take the snail to reach the top of the wall?

Thanks.

Hi Zyberk,

Here's my solution!


MathsGuru

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[mathsguru]

Herbie:

Dear All.

I have one qn below:

Fig 1 = 1 no. of cubes
Fig 2 = 4 no. of cubes
Fig 3 = 10 no. of cubes

How to create the formula to get the no. of cubes for fig 6?

Which figure will have 120 cubes?

Thanks!

Hi Herbie,

Here's my solution!


MathsGuru

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

[mathsguru]

YLH88:

hi Mathsguru,


Need help in solving the following questions :

1) Sally and Joseph have an equal number of coins in their coin boxes. Every day, Sally takes out 5 coins and Joseph takes out 3 coins. When Sally finishes all her coins, Joseph still has 64 coins left. How many coins do they have altogether at first ?


2) At 2pm, a car travelled from Town A to Town B at an average speed of 80 km/h. At the same tme, a van travelled from Town B to Town A. After sometime, the car and van passed each other and were 20 km apart at 5pm. The car arrived at Town B at 7pm
a) Find the average speed of the van
b) What time did the van arrive at Town B ?


3) Celia wants to make as much tropical fruit shake as possible. The tropical fruit shake comprises of honey, strawberry and milk in the ratio of 1 : 3 : 7. She found that honey is sold at $1.50 per 100g, strawberry at $2 per 100g and milk at $1 per 100g. If she already has 900g of honey and $161 to spend,
a) find the amount of honey, strawberry and milk she can buy to maximize the amount of tropical fruit shake she can make.
b) How much money would she have left after buying honey, strawberry and milk ?

Thank you very much!

Hi YLH88,

Here're my solutions!


MathsGuru

http://www.postimage.org/image.php?v=Tsqpi7J

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

http://www.postimage.org/image.php?v=Tsqpn70