Tutor MathsGuru: Ask me for your burning Maths questions!

[hljthjrh]

Almighty:

hljthjrh:

Hi Mathsguru, pls advise on how u interpret this question:


Peter & Ali met at 9 am. Peter's watch is 15 mins faster than the actual time. Ali was earlier than him by 10mins.
If Peter reached on time, according to the time shown on his watch, what is the actual time Ali arrive?

Is the answer 8.50am??

No, the answer is not 8.50am. My answer is also different from the teacher's. Posted here to find out how others interpret the question.

[Ngserene617]

mathsguru:

Original Title: Let MathsGuru Answer Your Burning Maths Questions!


:welcome:

Dear Parents,

Are you frustrated/stuck when helping your child solve his/her Maths questions? Are you inclined to use Algebra most of the time? Do you have difficulty trying to use diagrams or other heuristic methods (that Primary School students learn) to solve?

:idea: Post your questions here and see how MathsGuru solve them to the best of her ability. Detailed solutions will be posted back in this thread.


Hi MathsGuru,

kindly assist me in this question:
1. Samy spent 2/5 of his money on a toy car and 1/6 of the remaining money on a storybook.
a) What fraction of his money had he left?
b) If he had $40 left, how much had he at first ?

So start asking and watch this space!!

Cheers :celebrate: ,
MathsGuru

P/S (Disclaimer, in case you're wondering...):
Although MathsGuru is a full-time Maths tutor, this thread is meant to be an absolutely free resource for parents (or even children) with no strings attached. Just someone who's passionate about Maths and wanna spread the fun in learning Maths with others.

[super star]

please help me with these problems


(i)Timer A beeps every 4 minutes.Timer B beeps every 10 minutes.Both timer beep at 8:30 a.m.when will be the next time they beep together again?

(ii)How many cubes of side 2cm can be fitted into Box A of dimension 12cm by 5 cm by 7cm? my ans is 52…the ans key says 36.which is correct. pls explain

[blessedami]

hljthjrh:

Almighty:

[quote=\"hljthjrh\"]Hi Mathsguru, pls advise on how u interpret this question:


Peter & Ali met at 9 am. Peter's watch is 15 mins faster than the actual time. Ali was earlier than him by 10mins.
If Peter reached on time, according to the time shown on his watch, what is the actual time Ali arrive?

Is the answer 8.50am??

No, the answer is not 8.50am. My answer is also different from the teacher's. Posted here to find out how others interpret the question.[/quote]Is the answer 8.35 am?

[super star]

please help me with this problem

Adrian and bob started driving at the same time. bob took 6hrs to complete his journey while adrian took 9hrs to complete his.After 3 hrs ,the 2 men were left with the same distance to complete.what is the ratio of the distance of bob’s journey to the distance of adrian’s journey.?

[super star]

Is the ans 8:35am

blessedami:

hljthjrh:

[quote=\"Almighty\"]
Is the answer 8.50am??

No, the answer is not 8.50am. My answer is also different from the teacher's. Posted here to find out how others interpret the question.

Is the answer 8.35 am?[/quote]

[Yu Xuan]

super star:

please help me with these problems


(i)Timer A beeps every 4 minutes.Timer B beeps every 10 minutes.Both timer beep at 8:30 a.m.when will be the next time they beep together again?

(ii)How many cubes of side 2cm can be fitted into Box A of dimension 12cm by 5 cm by 7cm? my ans is 52...the ans key says 36.which is correct. pls explain

Hi ...

1) Common multiple of 4 and 10 is 20.
After 8.30am the next time both timer will beep together is 20 mins after 8.30am i.e 8.50am

2) 12 / 2 = 6
5 / 2 = 2 R 1
7 / 2 = 3 R 1
6 * 2 * 3 = 36

[livewith_vanilla]

Adrian and bob started driving at the same time. bob took 6hrs to complete his journey while adrian took 9hrs to complete his.After 3 hrs ,the 2 men were left with the same distance to complete.what is the ratio of the distance of bob’s journey to the distance of adrian’s journey.?



-

Bob will complete 1/6 of his journey in one hour
Adrian will complete 1/9 of his journey in one hour

Three hours:

Bob will complete 3/6 of his journey
Adrian will complete 3/9 of his journey

That leaves Bob with 3/6 of his journey to complete and Adrian with 6/9 of his journey.

3/6B=6/9A
1/2B=2/3A

Bob->4u
Adrian->3u

B:A
4:3

Not sure if correct

[livewith_vanilla]

Ngserene617:

mathsguru:

Original Title: Let MathsGuru Answer Your Burning Maths Questions!


:welcome:

Dear Parents,

Are you frustrated/stuck when helping your child solve his/her Maths questions? Are you inclined to use Algebra most of the time? Do you have difficulty trying to use diagrams or other heuristic methods (that Primary School students learn) to solve?

:idea: Post your questions here and see how MathsGuru solve them to the best of her ability. Detailed solutions will be posted back in this thread.


Hi MathsGuru,

kindly assist me in this question:
1. Samy spent 2/5 of his money on a toy car and 1/6 of the remaining money on a storybook.
a) What fraction of his money had he left?
b) If he had $40 left, how much had he at first ?

So start asking and watch this space!!

Cheers :celebrate: ,
MathsGuru

P/S (Disclaimer, in case you're wondering...):
Although MathsGuru is a full-time Maths tutor, this thread is meant to be an absolutely free resource for parents (or even children) with no strings attached. Just someone who's passionate about Maths and wanna spread the fun in learning Maths with others.

Hi MathsGuru,

kindly assist me in this question:
1. Samy spent 2/5 of his money on a toy car and 1/6 of the remaining money on a storybook.
a) What fraction of his money had he left?
b) If he had $40 left, how much had he at first ?


I take that this is your question?

My solution:

a)1-1/6=5/6

That means Sam had 5/6 of the remainder left.

1-2/5=3/5

3/5 is the remainder.

Hence,

5/6x3/5=1/2

Ans:1/2

b)

1/2 of the money= $40

Thus,

$40x2=$80

Ans:$80

[Dharma]

super star:

please help me with this problem

Adrian and bob started driving at the same time. bob took 6hrs to complete his journey while adrian took 9hrs to complete his.After 3 hrs ,the 2 men were left with the same distance to complete.what is the ratio of the distance of bob's journey to the distance of adrian's journey.?

Time ratio => Bob : Adrian = 1 : 2
Speed ratio => Bob : Adrian = 2 : 1

Distance ratio => Bob : Adrian = (2 x 6) : (1 x 9) = 4 : 3