Q&A - P4 Math

[SignorWinter]

Oh heck, my math has deteriorated to the point of despair. :x

[BigDevil]

Please help with this…


Joyce, Perry, Tanya and Seetha shared a box of stickers.
After distributing all the stickers, J got thrice as many stickers as T.
If P gave 38 stickers to S, they would both have the same number
of stickers. P would then have half as many stickers as J.
If there were 280 stickers in the box in the end, how many stickers
did J and P have respectively at first.


So I figured out there is a total of 7u (J 3u, T 1u, P 1.5u+38, S 1.5u-38),
but I just couldn’t figure out how to fit 280 into the model.

[Maths Hub]

BigDevil:

Please help with this...


Joyce, Perry, Tanya and Seetha shared a box of stickers.
After distributing all the stickers, J got thrice as many stickers as T.
If P gave 38 stickers to S, they would both have the same number
of stickers. P would then have half as many stickers as J.
If there were 280 stickers in the box in the end, how many stickers
did J and P have respectively at first.


So I figured out there is a total of 7u (J 3u, T 1u, P 1.5u+38, S 1.5u-38),
but I just couldn't figure out how to fit 280 into the model.

Hi BigDevil,

The total is always the same at 280. So you can draw 4 models for the 4 of them and the total is 280.

7u --> 280
1 u--> 280/7=40
Therefore,
J--> 3 units-->3X40=120
P--> 1.5 units +38--> 98

Hope that helps.

[BigDevil]

Eh??? The way I read the question is that 280 stickers were left over after distributing the stickers.


So 280 has always been the total number? That certainly makes the problem solvable.

Thanks!

[tracywham]

Hi, need help on this:


At a durian plantation, there were a number of durians on sale. For every 16 durians bought, 2 durians were given a way free. Mr Yusoff received a total of 96 durians free while Mr Hong received 112 durians free. If there were 45 durians left, how many durians were on sale?

(is there a faster way to solve this instead of drawing tables?)

[tianzhu]

tracywham:

Hi, need help on this:


At a durian plantation, there were a number of durians on sale. For every 16 durians bought, 2 durians were given a way free. Mr Yusoff received a total of 96 durians free while Mr Hong received 112 durians free. If there were 45 durians left, how many durians were on sale?

(is there a faster way to solve this instead of drawing tables?)

Hi

Good Morning.

A very “Happy Mother’s Day”

You may use the “Grouping Concept”

Mr Yusoff and Mr Hong received (96 +112) or 208 durians free.

For a group of 16 durians bought, 2 durians were given away free.

208/2 ----- 104

104*16 ----- 1664

Number of durians on sale ------ 1664 + 208 + 45 ------ 1917

Best wishes

[titank]

Hi All,


Siti had 6 times as many apples as David at first. After Siti had given 450 apples to David, they had an equal number of apples.

(a) Find the number of apples David had at first.
(b) David gave away some apples and had half the number of apples Siti had. How many apples did David give away.

[titank]

Mary went shopping with some money.


In shop A, Mary spemt 2/3 of her monry on a blouse. At the bookstore, Mary spent 1/4 of her remaining money on a book. Finally, she spent all her monry to buy 2 CDs at $15 each How much did she have at first.

[titank]

Siti, Rahmesh & Peter had 528 stickers at first. Siti bought another 32 stickers, Ramesh gave 1/5 of his stickers away & Peter was given as many stickers as he had at first by his father. In the end, all three of them had equal number of stickers. Find the number of stickers Siti had at first.

[PapayaDad]

titank:

Hi All,


Siti had 6 times as many apples as David at first. After Siti had given 450 apples to David, they had an equal number of apples.

(a) Find the number of apples David had at first.
(b) David gave away some apples and had half the number of apples Siti had. How many apples did David give away.

At first
D=2u
S=12u

In the end
D=7u....receive 5u from Siti
S=7u....give 5u to David
5u=450
u=90
At first D have 2u = 2 x 90 = 180

B)from above both have 7u = 7 x 90 = 630
D gave away half 315