Q&A - P5 Math

[zeemimi]

speedmaths.com:

happyheart:

Can someone help to explain please. Urgent, Thanks.


Minah bought some dolls at an average price of $34 each. She bought another 2 dolls for $58 each, the average price would be $40. How mNy dolls did she buy altogether? Ans: 6

Hi happyheart,

One possible method:

Look at the difference in the prices of the dolls bought and the average price:
Difference between $34 and $40 is $6.
Difference between $40 and $58 is $18.

The ratio of the price differences is $6:$18 or 1:3

The ratio of the number of dolls bought will be the reverse, or 3:1. or 6:2.
Minah bought 6 dolls for $34 each, and she bought 2 dolls for $58 each.

Total number of dolls bought is 6 + 2 = 8.

Hope this helps.

Cheers

speedmaths.com

May i know if there is another method to solve this question? I don't understand the reason for taking the difference between 40 and 58. :?

[MathIzzzFun]

zeemimi:

speedmaths.com:

Can someone help to explain please. Urgent, Thanks.


Minah bought some dolls at an average price of $34 each. She bought another 2 dolls for $58 each, the average price would be $40. How mNy dolls did she buy altogether? Ans: 6

Hi happyheart,

One possible method:

Look at the difference in the prices of the dolls bought and the average price:
Difference between $34 and $40 is $6.
Difference between $40 and $58 is $18.

The ratio of the price differences is $6:$18 or 1:3

The ratio of the number of dolls bought will be the reverse, or 3:1. or 6:2.
Minah bought 6 dolls for $34 each, and she bought 2 dolls for $58 each.

Total number of dolls bought is 6 + 2 = 8.

Hope this helps.

Cheers

speedmaths.com

May i know if there is another method to solve this question? I don't understand the reason for taking the difference between 40 and 58. :?

Hi

http://i46.tinypic.com/2j624jr.png\">

cheers.

[zeemimi]

MathIzzzFun:

Hi

http://i46.tinypic.com/2j624jr.png\">

cheers.

thanks mathizzzfun. the picture makes everything clearer.

[MathIzzzFun]

zeemimi:

MathIzzzFun:

Hi

http://i46.tinypic.com/2j624jr.png\">

cheers.

thanks mathizzzfun. the picture makes everything clearer.

u r welcome

cheers.

[zico]

Thanks in advance to anyone who can help.


--------------------

Leela and Kumar shared a sum of money. Leela's share was $90 less than Kumar's. After Kumar gave 1/7 of his share to Leela, Leela had $10 more than Kumar.

(a) how much did Leela have at first?

(b) What was the sum of money?

[zico]

Thanks in advance to anyone who can help.


--------------------

Leela and Kumar shared a sum of money. Leela's share was $90 less than Kumar's. After Kumar gave 1/7 of his share to Leela, Leela had $10 more than Kumar.

(a) how much did Leela have at first?

(b) What was the sum of money?

[Suz855]

XxxxXxxleela. Kumar

Xxxxxxx7u-90 7u
Change+1u. -1u
8u-90. 6u

8u-90-6u=10
2u=100
1u=50
Leela at first 7x50-90=260
b) 260+350=610

[tianzhu]

zico:

Thanks in advance to anyone who can help.


--------------------

Leela and Kumar shared a sum of money. Leela's share was $90 less than Kumar's. After Kumar gave 1/7 of his share to Leela, Leela had $10 more than Kumar.

(a) how much did Leela have at first?

(b) What was the sum of money?

Hi

You may work with MD or units.

Start with Kumar ------ 7 units.

After Kumar gave 1/7 or 1 unit to Leela, Leela had $10 more than Kumar.

Kumar ------- 6 units
Leela -------- 6 units + 10

Before Leela receive 1 unit from Kumar, she had (5 units + 10)

Leela's share was $90 less than Kumar's.

5 units + 10 + 90 -------- 7 units

2 units -------- 100
1 unit ------- 50

Leela --------- (5*50 + 10) -------260

Kumar ------- 350

The sum of money -------- 260 + 350 -------- 610

Best wishes

[zico]

Wow... thanks thanks !


:lovesite:

[savoury sweet]

Hi, can anyone help me with this question? Thks


Lily would like to cut out as many isosceles triangles of the same shape and size from a rectangular piece of paper shown length 29cm and breath 14cm. Each isosceles triangle should have a base of 6cm and a height of 4 cm. What is the maximum number of isosceles triangles she can cut ?

My apologies, I could not draw the intended rectangle and isosceles triangle.