Q&A - P4 Math

[tianzhu]

concerned1970:

5) Mrs Kang paid $42 for 3 fish and 2 chickens. 2 fish cost as much as a chicken. What was the cost of the 2 chickens?

Hi

Fish ----- 1 unit
Chicken ----- 2 units

Cost for 2 chickens ------ 4 units
Cost for 3 fish ----- 3 units

7 units ----- 42
1 unit ----- 6

4 units ----- 24 (cost of 2 chickens)

Best wishes

[tianzhu]

concerned1970:

Mrs Wong was short of $42 if she bought 5 similar vases so she bought 3 such vases and has $12 left. What was the cost of each vase?

Hi

This is a question on “Excess and shortage”.
Some may call it “Gap and Difference” concept.

Please refer to this link. There is a similar type of question.

If Aziz buys 6 pens, he will have $6 left
If he buys 8 pens, he will be short of $2.
How much $ does he have?

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=66&t=149&hilit=excess+shortage&start=640

42 + 12 ----- 54
54/2 ----- 27 (cost of vase)

Best wishes

[tianzhu]

concerned1970:

Lisa has 5 bags of apples and 3 boxes of mangoes. The number of apples in each bag is the same as the number of mangoes in each box. There are 56 fruits altogether. How many apples does Lisa have?

Hi

8 units ----- 56
1 unit ----- 7

Apples ----- 3 units ------- 21

Best wishes

[tianzhu]

concerned1970:

There are 57 coins in Box A and 256 coins in Box B. how many coins must be transferred from Box B to Box A so that there will be 47 more coins in Box B than Box A?

Hi

The total number of coins remains the same.

At first
Box A ----- 57
Box B ----- 256
Total ----- 313

In the end
Box A ----- 133
Box B ----- 180
Total ----- 313

Number of coins to be transferred ------ 256 – 180 ----- 76

Best wishes

[tianzhu]

Hi


Hope this helps.

Best wishes.

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[tianzhu]

Hi


Hope this helps.

Best wishes.

http://farm7.static.flickr.com/6237/6265695867_2db8e8f6f7_z.jpg\">

[ajmum]

Can anyone help to solve this question ? Thanks

[corneyAmber]

ajmum:

Can anyone help to solve this question ? Thanks

Your question is missing. Forgot to attach the jpg file?

[concerned1970]

tianzhu:

concerned1970:

There are 57 coins in Box A and 256 coins in Box B. how many coins must be transferred from Box B to Box A so that there will be 47 more coins in Box B than Box A?

Hi

The total number of coins remains the same.

At first
Box A ----- 57
Box B ----- 256
Total ----- 313

In the end
Box A ----- 133
Box B ----- 180
Total ----- 313

Number of coins to be transferred ------ 256 – 180 ----- 76

Best wishes

Tysm for yr selfless and generous help! How did u get 133 in Box A and 180 in Box B in the end?

[concerned1970]

tianzhu:

concerned1970:

6) 30 children attended a party. Each girl ate 3 chicken wings and each boy ate 4 chicken wings. The boys ate 36 more chicken wings than the girls. How many boys attended the party?

Hi

Please refer to this link. There is a similar type of question.

There are 40 pupils in a class. If each boy is given 3 sweets and each girl is given 5 sweets, the girls will have 56 sweets more than the boys. How many girls are there in the class?

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&start=1570

For every increase of 1 girl, the difference in the number of chicken wings drops by 7

120 - 36 ----- 84
84/7 ----- 12

Girls ----- 12
Boys ----- 18

Best wishes

Hi Tianzhu! Seriously, I've great difficulty in understanding in solving this sum.
How to tell the difference of chicken wings is dropped by 7 for every increase of a girl? How did you get 120 and why was it divided by 7? Ty!