Tutor MathsGuru: Ask me for your burning Maths questions!

[mathsguru]

YLH88:

Jack had some watermelons. He gave half of his watermelons to Terry. Terry then gave half of his durians to Jack. Jack sold 212 watermelons and Terry sold 56 durians. In the end, the ratio of watermelons to durians for Jack and Terry is 1:8 and 1:2 respectively. How many watermelons did Jack have at first?

Hi YLH88,

Here's my solution

Cheers,
MathsGuru

http://www.postimage.org/image.php?v=gx374x9

[mathsguru]

rubydoll:

Good morning.


Kindly help on the following maths sums:

1) The lengths of two rectangles are 11m and 19m respectively. Their total area is 321meter square. What is the diferrence in their areas?

2)Mrs Tan had $800 at first. 80% of her money consisted of $5 notes and the rest were $10 notes. After she spend some $5 notes, the remaining $5 notes was 60% of the money she had left. How much did Mrs Tan spend?

3)There are 147 pages in a science textbook. What is the total number of digits on all the pages of the textbook.

4)A group of people went hunting. On the average, 6 people hunted 5 rabbits, 15 people hunted 2 deer and 10 people hunted 1 buffalo. The total number of animals hunted was 6 more than the total number of people who went hunting. How many people went hunting?

Many thanks for your help
rubydoll

Hi Rubydoll,

Here are my solutions

Cheers,
MathsGuru

http://www.postimage.org/image.php?v=Ts2XdFi

http://www.postimage.org/image.php?v=Ts2Xg9r

http://www.postimage.org/image.php?v=Ts2XiEA

http://www.postimage.org/image.php?v=Ts2Xl8J

[mathsguru]

fudgemum:

Hi, I am not able to draw the picture.There are three identical circles A, B and C. The circumference of each circle passes through the centre of the other two circles. So we have regions like

A only, B only, C only,
A and B only, B and C only, A and C only,
A and B and C (center portion).

How do you proove that
A and B only, B and C only, A and C only (i.e A insersection B, B intersection C , and C intersection A)
this area is half of the circle.
TIA

Hi Fudgemum,

Here's my solution

Cheers,
MathsGuru

http://www.postimage.org/image.php?v=gx37g_S

[mathsguru]

happies:

Hi

Thanks for helping to solve below questions.

1) The ratio of John's age to his uncle's age is 1:4. In 30 years' time, the ratio will become 2:3. How old is John now?

2) The salary of Mr Lim and Mr Tan was in the ratio 3:5. After they gave away an equal amount of $3500 to their wives, the ratio became 1:4. What was Mr Lim's salary?

Hi Happies,

Here are my solutions

Cheers,
MathsGuru

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

http://www.postimage.org/image.php?v=PqMKTV0

[mathsguru]

cafelatte:

Kamala had 5026g of flour in a bag. She bought another packet of flour of mass 4157g. She transferred some flour from the packet to the bag. The mass of the flour in the bag became twice the mass of the flour left in the packet. How much flour was in the packet in the end ?

Hi Cafelatte,

Here's my solution

Cheers,
MathsGuru

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

[mathsguru]

leesf:

Hi Mathsguru,


I have a question.

A & B share some beads. If A gives B 1/3 of his share, B would have 70 beads more than A. If A gives B 1/5 of his share, B would ahve 10 beads more than A. How many beads do A have at first?

Thanks

Hi Leesf,

Here's my solution.

Cheers,
MathsGuru

http://www.postimage.org/image.php?v=Ts2XP4r

[mathsguru]

fanren:

Hi

i have a qn hope someone can help.

Bobby places 12 cards on a table. Each card is either red or black in colour. If the fraction of black cards is 7/12, what is the smallest number of additionals cards that Bobby needs to put on the table so that the fraction of black cards becomes 5/8 ?

thanks in advance!

Hi Fanren,

Here's my solution.

Cheers,
MathsGuru

http://www.postimage.org/image.php?v=gx383TJ

[mathsguru]

cafelatte:

Need to know the step-by-step thinking procedure for solution this question :


When one of the following numbers is excluded, the sum of the remaining numbers is divisible by 2,3 and 5. What is the number?
29,28,32,45,29,47,17,11?

Hi Cafelatte,

Here's my solution.

Cheers,
MathsGuru

http://www.postimage.org/image.php?v=Ts2Y5xr

[mathsguru]

stuckinratio:

Hi, just learn that the q on the cake and cream puff is flawed. The q should read as 'The no of cakes was twice the no of cream puffs. After 180 cakes and 42 cream puffs were sold, the ratio of the no of cakes left to the no of cream puffs was 2:5. How many cakes and cream puffs were in the shop at first?


the answer is 306.

Hi Stuckinratio,

Here's my solution

Cheers,
MathsGuru

http://www.postimage.org/image.php?v=gx38AjA

[mathsguru]

firebird:

Good morning


Kindly help me on the following P6 maths:

A fruit seller had a total of 204 red and green apples in the ratio of 9:8.
After he sold an equal number of each type of apple, the number of red and green apples left was in the ratio of 9:5. How many apples did he sell altogether?

Hi Firebird,

Here's my solution

Cheers,
MathsGuru

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