Tutor MathsGuru: Ask me for your burning Maths questions!

[catddy2002]

Hi,


How to solve this questions:

1) 3/4 of a cake was cut into 8 pieces. What fraction f the cake is each of the 8 pieces?

1) 1/8
2) 3/8
3) 3/32
4) 29/32 ( )

2) What is twice the sum of 20 hundreths, 5 tenths and 17 ones?

1) 17.25
2) 17.70
3) 222
4) 2022 ( )

[starlight1968sg]

catddy2002:

1) 3/4 of a cake was cut into 8 pieces. What fraction f the cake is each of the 8 pieces?


1) 1/8
2) 3/8
3) 3/32
4) 29/32 ( )

2) What is twice the sum of 20 hundreths, 5 tenths and 17 ones?

1) 17.25
2) 17.70
3) 222
4) 2022 ( )

1) (3/4) / 8 = (3 / 4) * (1 /8 ) = 3/32
2) 20 hundredths = 0.20,
5 tenths = 0.5
17 ones = 17
the sum is 17.7.
Then twice is 17.7 * 2 = ???

[maths6a]

Dharma:

maths6a:

Hi Can anyone help with this question?

How many 3-digit number combinations are there on a 3-digit number lock if all the 3-digits used are different and the numbers are greater than 800?

Thanks.

Digit in hundreds place => 8 or 9
Digit in tens place => 0, 1, 2, 3, 4, 5, 6, 7, 8 or 9
Digit in ones place => 0, 1, 2, 3, 4, 5, 6, 7, 8 or 9

Since the 3 digits used are different, you have 2 choices for hundreds place, 9 choices for tens place(1 choice already selected for 100s place) and 8 choices for the ones place (2 choices already chosen for 100s and 10s place)

No. of combinations = 2 x 9 x 8 = 144

Thanks for your solution. Will study it.

[Dharma]

clblinym:

Hi, Parents


Can anyone help solve the following math question. Many thanks.

The answer given is 5:2.

Amy
http://www.postimage.org/image.php?v=aVi95Tr

Ratio of Area of AEB : Area of AEC : Area of ADE = 1 : 4 : 2

Area of ABC = 1/2 X AB x Perpendicular Height
Area of ADC = 1/2 x DC x Perpendicular Height

AB : DC = Area of ABC : Area of ADC = (1+4 ) : 2 = 5 : 2

[Dharma]

super star:

Please help me with this problem

cinema admission tickets for children were priced at $8 each.there were 20 more than girls inthe cinema for the movie. For the second movie ,the number of boys decreased by 10% but the number of girls increased by 5%.if there were 408 children at the second movie, how much money was collected from the sales of admission ticket for the first movie?

Movie 1
Boys : 20u
Girls : 20u + 20

Movie 2
Boys : 18u + 18
Girls : 21u

18u + 18 + 21u = 408
39u = 390
1u = 10

Collection for Movie 1 = (40u + 20) x $8 = 420 x $8 = $3,360

[catddy2002]

starlight1968sg:

catddy2002:

1) 3/4 of a cake was cut into 8 pieces. What fraction f the cake is each of the 8 pieces?


1) 1/8
2) 3/8
3) 3/32
4) 29/32 ( )

2) What is twice the sum of 20 hundreths, 5 tenths and 17 ones?

1) 17.25
2) 17.70
3) 222
4) 2022 ( )

1) (3/4) / 8 = (3 / 4) * (1 /8 ) = 3/32
2) 20 hundredths = 0.20,
5 tenths = 0.5
17 ones = 17
the sum is 17.7.
Then twice is 17.7 * 2 = ???

Thanks, starlight1968sg!

For question 2, I did what you stated before asking this question in this forum. But the ans not in the mulitple choice, so i state in this forum to confirm that I'm right. That's printing error for this question.

[acehkr3009]

Hi,


Need some help on this question.

Not sure why question appear so small.

Here is the retype of the question:

If W & Y is the mid-point of AB and CD respectively, and Z & X are any points along AD and BC respectively. What is the fraction of the shaded portion ?

Thanks.

http://www.postimage.org/image.php?v=Ts7ucsS

[acehkr3009]

Hi Parents,


Here is a question fr my son’s math assignment, which I think may be incorrect…need your advise…

The average of a set of 4 numbers is M. If 79 is added to this set of number, the average becomes M + 3. What is the value of M?

Thanks.

[atutor2001]

acehkr3009:

Hi Parents,


Here is a question fr my son's math assignment, which I think may be incorrect...need your advise..

The average of a set of 4 numbers is M. If 79 is added to this set of number, the average becomes M + 3. What is the value of M?

Thanks.

Hi, if I am not wrong M=64. The working goes like this :

New average (M+3) = 79 - (3x4) = 67
Old average (M) = 67 - 3 = 64

[Muffins]

Wow, thanks.


Was a little :? :?: with that problem. Couldn't figure out the connection between the working I had gotten, but you condensed it into two main steps. :thankyou: :thankyou: