Q&A - P4 Math

[Happy Mama]

imacsg:

Is a square, a rectangle? Can anyone advise.

A square is a rectangle but a rectangle is not a square, simply because a square is a subset of a rectangle and can fit into a rectangle while vice versa is not true.

[imacsg]

Hi Happy Mama and Ksi,

Thanks for your explanation.

[Jamesbond]

Wendy and Ling had some ribbon. Wendy's ribbon was 8.68 m long at first. After she cut off 1.24m and gave this to Ling, Wendy had 4 times the total length of ribbon that Ling had. What was the original length of ribbon Ling had?


Pl explain me detail.....

[Studious Alien]

First, you subtract 1.24m from 8.68m which is 7.44m to find the length of Wendy’s ribbon in the end.

As they said that the length of Wendy’s ribbon was 4 times the total length of ribbon Ling had, you divide 7.44m by 4 which is 1.86m to find the length of Ling’s ribbon in the end.
Finally, you subtract 1.24m from 1.86m which is 0.62 ( Length of Ling’s ribbon in the end - Length of ribbon given by Wendy.) Ans:0.62m or 62cm

[Jamesbond]

There were some passengers on board an MRT train which began its journey from Jurong East station.At the first stop,5/8 of the passengers alighted and 16 passengers got in.At the second stop,half the passengers on the train got of and 23 passengers boarded the train.At the next stop,4/7 of the passengers alighted and 66 remained on the train.How many passengers did the train have at the start of its journey?

Can someone please help me fast? I have to hand up my school homework tomorrow
I would really appreciate your help

[chloecube]

Edwin weighs 48kg680g. He is 0.8 as heavy as susan. Find their total weight in kg.


I do not quite understand the 2nd sentence.

[corneyAmber]

Jamesbond:

Wendy and Ling had some ribbon. Wendy's ribbon was 8.68 m long at first. After she cut off 1.24m and gave this to Ling, Wendy had 4 times the total length of ribbon that Ling had. What was the original length of ribbon Ling had?


Pl explain me detail.....

Before, Ling's ribbon -> u
Before, Wendy's ribbon -> 8.68

After, Ling's ribbon -> u+ 1.24
After, Wendy's ribbon -> 8.68-1.24 = 7.44

To equal them for \"after\", 4 x Ling = Wendy (or you can view as Ling = 1/4 Wendy)

4(u+1.24) -> 7.44
4u + 4.96 -> 7.44
4u -> 2.48
u -> 0.62
Original length Ling had was 0.62m

[tianzhu]

chloecube:

Edwin weighs 48kg680g. He is 0.8 as heavy as susan. Find their total weight in kg.


I do not quite understand the 2nd sentence.

Hi

This means Edwin --- 4 units and Susan --- 5 units.

Best wishes

[MathIzzzFun]

Jamesbond:

There were some passengers on board an MRT train which began its journey from Jurong East station.At the first stop,5/8 of the passengers alighted and 16 passengers got in.At the second stop,half the passengers on the train got of and 23 passengers boarded the train.At the next stop,4/7 of the passengers alighted and 66 remained on the train.How many passengers did the train have at the start of its journey?

Can someone please help me fast? I have to hand up my school homework tomorrow
I would really appreciate your help

Hi
work backwards..

In the end, 66 remained = 3/7 of passengers after 2nd stop.

after 2nd stop --> 66/3 x 7 = 154 passengers on board
154 - 23 = 131 (after 1/2 the passengers got off)--> 1/2 the passengers after 1st stop

after 1st stop --> 2 x 131 = 262 passengers on board
262 - 16 = 246 (after 5/8 alighted) --> 3/8 of passengers at start of journey
Number of passengers at start of journey = 246/3 x 8 = 656

cheers.

[MathIzzzFun]

chloecube:

Edwin weighs 48kg680g. He is 0.8 as heavy as susan. Find their total weight in kg.


I do not quite understand the 2nd sentence.

hi

rewrite 0.8 as fraction --> 0.8 = 4/5.
So, the question becomes :
Edwin weighs 48kg680g. He is 4/5 as heavy as susan. Find their total weight in kg.

cheers.