Q&A - P5 Math
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That’s brilliant, MathIzzzFun! I didn’t think of that. Thank you very much!
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Hi pls help
Two classes of children are having physical education lesson together. If their teachers ask them to get into groups of 7 there will be 6 children extra. If their teacher ask them to get into groups of 8 there will be 7 children short. If one of the classes has 5 more children than the other, find the class size of the smaller class.
Tia! -
Hi pls advice whether the following qn can be solved using another methods instead of using "Guess & Check" ?
John has 97 toy cars and trishaws. All the cars have 157 more wheels than all the trishaws. How many more toy cars than trishaws does John has ?
TIA -
snowball:
similar to this question on donation - http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=68&t=25129&start=1750Hi pls advice whether the following qn can be solved using another methods instead of using \"Guess & Check\" ?
John has 97 toy cars and trishaws. All the cars have 157 more wheels than all the trishaws. How many more toy cars than trishaws does John has ?
TIA
Assume all are cars, total number of wheels = 97 x 4 = 388
388 - 157 = 231
number of trishaws = 231 / (3+4) = 33
number of cars = 97 - 33 = 64
cheers. -
quekcc:
When in groups of 8, there will be 1 extra.elisammom:
Hi pls help
Two classes of children are having physical education lesson together. If their teachers ask them to get into groups of 7 there will be 6 children extra. If their teacher ask them to get into groups of 8 there will be 7 children short. If one of the classes has 5 more children than the other, find the class size of the smaller class.
Tia!
When in groups of 7, there will be 6 extra.
So, if you put 1 additional children into the groups of 7, you could from 5 groups of 8, with 1 extra.
So there are 5 x 8 + 1 = 41 children.
As 1 of the classes has 5 more than the other, so 2 units = 41 - 5 = 36
1 unit = 36/2 = 18 children.
The class size of the smaller class is 18.
That's what I have. But the answer given is 46. Pls help thanks -
elisammom:
Hi
That's what I have. But the answer given is 46. Pls help thanks
The number of groups stays the same in both scenarios.
To increase 1 more student per group (8-7), you need 13 more students (6+7)
Number of groups ------13
Number of students ------ 13*7 + 6 ------- 97 (or 13*8 - 7 ----- 97)
97-5 ------ 92
92/2 ------ 46
Best wishes -
tianzhu:
Hielisammom:
That's what I have. But the answer given is 46. Pls help thanks
The number of groups stays the same in both scenarios.
To increase 1 more student per group (8-7), you need 13 more students (6+7)
Number of groups ------13
Number of students ------ 13*7 + 6 ------- 97 (or 13*8 - 7 ----- 97)
97-5 ------ 92
92/2 ------ 46
Best wishes
Understand! On the context that the nos of group must be the same;)
Thanks! -
Jane bought some slices of cheesecake and mango cake.she spend $60 and $40 on the cheesecake and mango cake respectively. each slice of mango cake cost $2 more than each slice of the cheesecake.she bought twice as many cheesecake as mango cakes. find the cost of each slice of cheesecake.
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chloecube:
Jane bought some slices of cheesecake and mango cake.she spend $60 and $40 on the cheesecake and mango cake respectively. each slice of mango cake cost $2 more than each slice of the cheesecake.she bought twice as many cheesecake as mango cakes. find the cost of each slice of cheesecake.
First, find the amount spent on same number of cheesecakes and mango cakes ie 1 unit of cheesecakes and 1 unit of mango cakes OR 2 units cheesecakes and 2 units of mango cakes
1 unit of cheesecakes --> $60/2 = $30
1 unit of mango cakes --> $40
$40 - $30 = $10
Number of slices of cakes in 1 unit --> $10 / $2 = 5
cost of 1 slice of cheesecake = $ 30/5 = $6
cheers. -
MathIzzzFun:
thks for getting back.chloecube:
Jane bought some slices of cheesecake and mango cake.she spend $60 and $40 on the cheesecake and mango cake respectively. each slice of mango cake cost $2 more than each slice of the cheesecake.she bought twice as many cheesecake as mango cakes. find the cost of each slice of cheesecake.
First, find the amount spent on same number of cheesecakes and mango cakes ie 1 unit of cheesecakes and 1 unit of mango cakes OR 2 units cheesecakes and 2 units of mango cakes
1 unit of cheesecakes --> $60/2 = $30
1 unit of mango cakes --> $40
$40 - $30 = $10
Number of slices of cakes in 1 unit --> $10 / $2 = 5
cost of 1 slice of cheesecake = $ 30/5 = $6
cheers.
i do not quite under this part,
\"Number of slices of cakes in 1 unit --> $10 / $2 = 5\"
i understand $10 is the difference between the 2 cakes if equal nos of cakes are bought, and $2 is the price difference.
so what is 5?
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