Tutor MathsGuru: Ask me for your burning Maths questions!

[kancheongmum]

hi muffins

tks for the solution understand now

[Carrot]

Hi Maths Guru please help :?: DS cannot solve and I also cant do


My friend and I went to a bookstore to buy books. We bought a total of 18 books over the last 3 days. The number of books I bought on the third day is equal to the sum of the total number of books my friend bought on the 2nd day and third days. The number of books my friend bought on the first day is 2 more than the sum of what I bought on the first and second days. How many books did each one of us buy?

[Tang]

Carrot:

Hi Maths Guru please help :?: DS cannot solve and I also cant do


My friend and I went to a bookstore to buy books. We bought a total of 18 books over the last 3 days. The number of books I bought on the third day is equal to the sum of the total number of books my friend bought on the 2nd day and third days. The number of books my friend bought on the first day is 2 more than the sum of what I bought on the first and second days. How many books did each one of us buy?

Hello,

I bought 2 books less than my friend. We bought a total of 18 books.

So I - Small unit; My friend - Big unit.

[Carrot]

Tang:

Carrot:

Hi Maths Guru please help :?: DS cannot solve and I also cant do


My friend and I went to a bookstore to buy books. We bought a total of 18 books over the last 3 days. The number of books I bought on the third day is equal to the sum of the total number of books my friend bought on the 2nd day and third days. The number of books my friend bought on the first day is 2 more than the sum of what I bought on the first and second days. How many books did each one of us buy?

Hello,

I bought 2 books less than my friend. We bought a total of 18 books.

So I - Small unit; My friend - Big unit.

Hi Thanks for your quick response
hum...can you explain a bit on your working ? :? solution ? where to find the hint from question... is it my DS langunage level weak or question tricky ...he said he dono how to solve ... need to knw which area weak :idea:

[DragonAxe]

kancheongmum:

hi all


appreciate your help in the problem P6 Hokkien HK prelim Q15

A car and a coach travelled from Town A to Town B. The coach left Town A at 0648 and it took 5 hrs to reach Town B. The car started 30 mins later than the coach and it took 4 hrs to reach Town B. At what time did the car catch up with the coach? (ans 0918)

I saw the solution somewhere but don't understand so can't explain to my DS.

Thanks

Uh....

Coach travels 1/5 OR 4/20 of the distance every hour
Car travels 1/4 OR 5/20 of the distance every hour

1/2 * 4/20 = 2/20

5/20-4/20=1/20

2/20 divide by 1/20 = 2

0648-> +30min -> +2 hours -> 0718 -> + 2 hours => 0918h

ANSWER 0918h

[DragonAxe]

Carrot:

Hi Maths Guru please help :?: DS cannot solve and I also cant do


My friend and I went to a bookstore to buy books. We bought a total of 18 books over the last 3 days. The number of books I bought on the third day is equal to the sum of the total number of books my friend bought on the 2nd day and third days. The number of books my friend bought on the first day is 2 more than the sum of what I bought on the first and second days. How many books did each one of us buy?

ME MY FRIEND

Day DAY
1:2:3 1:2:3

(1u-1):1 (1u+1):1

Meaning

Me bought 1u-1+1u= 2u-1
He bought 1u+1+1u=2u+1

9-1=8
9+1=10

Me - 8
He - 10

[Tang]

Carrot:

Tang:

[quote=\"Carrot\"]Hi Maths Guru please help :?: DS cannot solve and I also cant do


My friend and I went to a bookstore to buy books. We bought a total of 18 books over the last 3 days. The number of books I bought on the third day is equal to the sum of the total number of books my friend bought on the 2nd day and third days. The number of books my friend bought on the first day is 2 more than the sum of what I bought on the first and second days. How many books did each one of us buy?

Hello,

I bought 2 books less than my friend. We bought a total of 18 books.

So I - Small unit; My friend - Big unit.

Hi Thanks for your quick response
hum...can you explain a bit on your working ? :? solution ? where to find the hint from question... is it my DS langunage level weak or question tricky ...he said he dono how to solve ... need to knw which area weak :idea:[/quote]
Hello,

We bought a total of 18 books over the last 3 days.
The number of books I bought on the third day is equal to the sum of the total number of books my friend bought on the 2nd day and third days.
The number of books my friend bought on the first day is 2 more than the sum of what I bought on the first and second days.

18 - 2 = 16
16 / 2 = 8 books --- I

18 - 8 = 10 books --- My friend

[firebird]

Dear Maths guru


Good morning.

Please help me on the Pei Hwa SA2 2009 Q17 paper 2:

Michael asked his classmate what time it was. Jackson the Math whiz replied with a cheeky grin, "It’s 2000 hours, 1990 minutes and 1980 seconds before midnight." Can you help Michael find out what time it is?

Thank you
Firebird

[singmathstutor]

firebird:

Dear Maths guru


Good morning.

Please help me on the Pei Hwa SA2 2009 Q17 paper 2:

Michael asked his classmate what time it was. Jackson the Math whiz replied with a cheeky grin, \"It's 2000 hours, 1990 minutes and 1980 seconds before midnight.\" Can you help Michael find out what time it is?

Thank you
Firebird

Let me try....

2000hrs = 83 1/3 day
leave out 83 days because we are interested only in hrs and min
1/3 day = 8 hrs

1990min = 33 1/6 hr = 1 day + 9 1/6 hr
9 1/6 hr = 9 hrs 10 min

1980 s = 33 min

Total time before midnight = 8 hrs + 9 hrs 10 min + 33 min
= 17 hrs 43 min

Use timeline

17 hrs 43 min before 12 midnight is 6.17 am

[firebird]

Dear Singmathstutor


You are correct.

Many thanks for the answer sir/madam.

With best regards
firebird