Q&A - P4 Math

[MathIzzzFun]

PiggyLalala:

racoon12:

[quote=\"MathIzzzFun\"[quote=\"started to be kiasu\"]Can somebody help me with this question? TIA


Jenny had 3/7 as much money as Kenny. If they spent $252 each, Jenny's money will be only 2/7 of Kenny's. How much money did Kenny have more than Jenny?


http://i46.tinypic.com/4l27o5.png\">


cheers.

Would like to know how you derive the 520 being amount kenny have more than jenny? Tia.

Typo mistake... ? Shld be 720[/quote]Oops.. typo... I will upload the corrected one later...

cheers

[doraemo]

Can somebody help me with this question?

Sumin participated in a Maths quiz with 20 questions. For every correct answer, she was awarded 3 points. For every wrong answer, 2 points were deducted. If Sumin scored 25 points for the quiz, how many questions did Sumin answer correctly?

[BigDevil]

htn:

Hi, need help for the following q:

Sammy is studying for a test. The number of pages he has read is twice as many as the number of pages he has not read. If he reads another 8 pages, the number of pages he has read will become thrice as many as the number of pages he has not read. How many pages are there in the science textbook?
TIA

http://i46.tinypic.com/2mwgux4.jpg\">

[BigDevil]

doraemo:

Can somebody help me with this question?

Sumin participated in a Maths quiz with 20 questions. For every correct answer, she was awarded 3 points. For every wrong answer, 2 points were deducted. If Sumin scored 25 points for the quiz, how many questions did Sumin answer correctly?

If Sumin had answered all questions correctly, she would have 20 x 3 = 60 points.
If she had answered 19 questions correctly, she would have (19 x 3) - 2 = 55 points

So for every wrong answer, she lost 5 points.

Since she scored 25 points, she had lost 60 - 25 = 35 points.
35 / 5 = 7
She had 7 wrong answers.

So she had (20 - 7) = 13 correct answers.

Check:
13 x 3 = 39
7 x 2 = 14
39 - 14 = 25

[MathIzzzFun]

racoon12:

MathIzzzFun:

[quote=\"started to be kiasu\"]Can somebody help me with this question? TIA


Jenny had 3/7 as much money as Kenny. If they spent $252 each, Jenny's money will be only 2/7 of Kenny's. How much money did Kenny have more than Jenny?

..corrected typo error..

http://i46.tinypic.com/eizye.png\">


cheers.

Would like to know how you derive the 520 being amount kenny have more than jenny? Tia.[/quote]..typo error...

cheers

[htn]

BigDevil:

htn:

Hi, need help for the following q:

Sammy is studying for a test. The number of pages he has read is twice as many as the number of pages he has not read. If he reads another 8 pages, the number of pages he has read will become thrice as many as the number of pages he has not read. How many pages are there in the science textbook?
TIA

http://i46.tinypic.com/2mwgux4.jpg\">

Hi, BigDevil

Thanks, are there other methods to solve this q?

[MathIzzzFun]

htn:

Hi, need help for the following q:

Sammy is studying for a test. The number of pages he has read is twice as many as the number of pages he has not read. If he reads another 8 pages, the number of pages he has read will become thrice as many as the number of pages he has not read. How many pages are there in the science textbook?
TIA

alternate approach... \"same total\" concept...

http://i47.tinypic.com/2i8xa4y.png\">

cheers.

[doraemo]

Thank you, BigDevil.

[Nebbermind]

WAH!! So many P4 working very hard after the SA2!!

[smartmummy]

Nebbermind:

WAH!! So many P4 working very hard after the SA2!!

May be preparing for SA2? My son's exam starts today.I will post two qns that he got wrong in his practise paper.