Q&A - P5 Math

[MathIzzzFun]

Oracle:

Yes Speedmath, I got it. Just have to put Serene on the same platform & everything becomes clear.


However this is a \"whole number\" question. Son hasn't been taught ratio yet so perhaps got to use MathIzzzFun's workings but I wonder how the common numerator 60 come about.

Could MathIzzzFun enlighten me please.

Thank you very much.

lowest common multiple of 3, 4, 10. You can choose any common multiple but lowest one preferred
for easier calculations.

cheers

[cmm]

Pls help with part b & c....


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[tianzhu]

cmm:

Pls help with part b & c....


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Hi

Please study Jamesbond’s question on pg 167 and pg170.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=68&t=25129&start=1670

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=68&t=25129&start=1690

The answers are 190 white triangles and pattern 130.

Best wishes

[Jamesbond]

There are some crystal and glass marbles in a pouch. If 3 crystal marbles are removed from the pouch, the number of crystal marbles left will be 1/6 of the glass marbles left. If 5 glass marbles are removed from the pouch, the number of crystal marbles left will be 1/4 of the glass marbles left. How many marbles are there in the pouch at first?


Solution given as
6u= 4u+ 43+5
6u=4u+12+5
6u-4u=12+5
2u=17
1u=8.5
6u+3=78.5+3
=59.5+3
=62.5…
Am not able to understand…pl help…

[Jamesbond]

Lim had some stickers and stamps for his class. The number of stickers was half as many as the number of stamps. After each pupil in the class had received 3 stickers and 8 stamps from Lim. He had 39 stickers and 2 stamps left. What was the total number of stickers and stamps Lim had at first?


Pl help me…

[tianzhu]

Jamesbond:

There are some crystal and glass marbles in a pouch. If 3 crystal marbles are removed from the pouch, the number of crystal marbles left will be 1/6 of the glass marbles left. If 5 glass marbles are removed from the pouch, the number of crystal marbles left will be 1/4 of the glass marbles left. How many marbles are there in the pouch at first?

Hi

Please take a look at this similar question.

Your question was discussed on page 59 of this thread earlier.

Based on the question as worded, the answer is 62.5.

At first
Crystal marbles ----- 1 unit + 3
Glass marbles ------ 6 units

In the end
Crystal marbles ----- 1 part
Glass marbles ------ 4 parts

Again, equalise the parts or cross multiply.

(1 unit + 3)*4 ------- 6units - 5
4 units + 12 ------- 6 units – 5

2 units ------ 17
1 unit ------ 8.5

Crystal marbles ------- 11.5
Glass marbles ------- 51
Total number of marbles -------- 62.5

Best wishes

http://farm8.staticflickr.com/7146/6728816353_e2a7aca824_z.jpg\">

[esj152104]

Hi,


Need help on this problem sum:

Jenny bought two rabbits. For each day after the first day of the week, the rabbits ate 40g more than the previous day. the rabbits grew fast, finishing 2450g of food in the first week. How much food did the rabbits eat on the first day?

Thanks

[esj152104]

Hi,


Need help on this problem sum:

Jenny bought two rabbits. For each day after the first day of the week, the rabbits ate 40g more than the previous day. the rabbits grew fast, finishing 2450g of food in the first week. How much food did the rabbits eat on the first day?

Thanks

[tianzhu]

Jamesbond:

Lim had some stickers and stamps for his class. The number of stickers was half as many as the number of stamps. After each pupil in the class had received 3 stickers and 8 stamps from Lim. He had 39 stickers and 2 stamps left. What was the total number of stickers and stamps Lim had at first?


Pl help me....

Hi

It helps to draw a simple sketch.

In the end

Stickers ------- 39 + 3units

Stamps ------- 2 + 8units

The number of stickers was half as many as the number of stamps.

78 + 6units ------- 2 + 8units

76 ------ 2units

38 ------ 1unit

Number of stickers@first ------ 39 + 3*38 ------ 153

Number of stampss@first ------ 306

Best wishes

[tianzhu]

Hi moderators


Please help to delete.

Best wishes