Q&A - P5 Math

[MathIzzzFun]

Jamesbond:

MathIzzzFun:

[quote=\"Jamesbond\"]Dawn and Minny had the same number of stickers at first. After Dawn gave 24 stickers to Minny. Minny had 5 times as many stickers as Dawn. How many stickers did Minny have at first?


Is some info missing in this sum....or is it possible to solve....My ds doubt....Pl help..

Hi

you can use MD or ratio ..
...concept --> total number of stickers remain the same...

In the end
Dawn's stickers : Minny's stickers --> 1u : 5u (total 6u)

at first
Dawn's stickers : Minny's stickers = 1:1 --> 3u : 3u (total 6u)

From above, observe that Dawn gave away 2u, and Minny received 2u

So, 2u --> 24, 1u--> 12
At first, Minny's stickers --> 3 x 12 = 36

cheers.

Ratio not yet started for my ds...can u explain in a diff way? Thx.[/quote]If A has same number of marbles as B, when A give 1 marble to B, B will have 2 more than A - A lose 1, B gain 1 so difference of 2.


similarly, after Dawn gave 24 to Minny, Minny will have 48 more than Dawn
so, 4 units --> 48, 1 unit --> 12 (Dawn, in the end )

At first, Minny's stickers = Dawn's stickers = 12 + 24 = 36

cheers

[tayobus]

:?: :salute: :thankyou:


An equal number of male & female runners participated in a marathon race.
After 980 female runners and 350 male runners dropped out of the race, the number of female runners left was 1/6 the number of male runners.
What was the total number of runners at the start of the race?
(Can help by showing the model-drawing?)

[MathIzzzFun]

tayobus:

:?: :salute: :thankyou:


An equal number of male & female runners participated in a marathon race.
After 980 female runners and 350 male runners dropped out of the race, the number of female runners left was 1/6 the number of male runners.
What was the total number of runners at the start of the race?
(Can help by showing the model-drawing?)

Hope this comes out ok... sketch on mobile...

http://i48.tinypic.com/16h3xo7.jpg\">

cheers.

[chloecube]

jack wants to buy a bicycle but is short of $44. Jill wants to buy the same bicycle but is short of $37. if they combine their money, they will have just enough money to buy the bicycle. what is the cost of 2 such bicycle?


thks for helping

[chloecube]

i think of a number which is less than 50. when the number is divided by 7. the reminder is 1. when the number is divided by 12, the reminder is 7. what is the number?


other than guessing, is there an easier method?

[chloecube]

what is the value of 1-2+3-4+5…47-48-49?

is the a formula for such question?

sorry for so many questions,thks

[MathIzzzFun]

chloecube:

jack wants to buy a bicycle but is short of $44. Jill wants to buy the same bicycle but is short of $37. if they combine their money, they will have just enough money to buy the bicycle. what is the cost of 2 such bicycle?


thks for helping

Can you work out the answer with this model ?

http://i47.tinypic.com/2cwo0go.png\">

cheers.

[MathIzzzFun]

chloecube:

what is the value of 1-2+3-4+5....47-48-49?

is the a formula for such question?

sorry for so many questions,thks

http://i46.tinypic.com/2a0c97c.png\">

cheers.

[MathIzzzFun]

chloecube:

i think of a number which is less than 50. when the number is divided by 7. the reminder is 1. when the number is divided by 12, the reminder is 7. what is the number?


other than guessing, is there an easier method?

List out multiples of 12 + 7, in the range
--> 43, 31, 19, 7

Divide these by 7 and find the number that leaves a remainder of 1 --> 43

cheers.

[Jamesbond]

Thanks for all ur help regarding my previous sum…Pl help in this…seems to be so simple…but my ds got confused…


James had $40 more than Ken. After James gave Ken $60, Ken had twice as much as James. How much money did James have at first?