Q&A - P5 Math

[happyheart]

Dear Small & Tianzhu,


Thank you very much for your help!

[small]

You are welcome, happyheart.

[Easy-going]

Hi

please help me with this question:
Painter A takes 6hrs to paint a room.
Painter A and B take 4 hrs to paint a room.
How long does B takes to paint a room?

[tianzhu]

Easy-going:

Hi

please help me with this question:
Painter A takes 6hrs to paint a room.
Painter A and B take 4 hrs to paint a room.
How long does B takes to paint a room?

Hi

A common multiple of 4 and 6 is 12.

Painter A ------ 6 h -------12 units
Painter A ------- 1h ------- 2 units

Painter A and B ------ 4h -------12 units
Painter A and B ------ 1h -------3 units

Painter B ------- 1h ------- 1 unit (3-2)

Painter B ------- 12h ------- 12 units (3-2)

Best wishes

[nanschia]

Easy-going:

Hi

please help me with this question:
Painter A takes 6hrs to paint a room.
Painter A and B take 4 hrs to paint a room.
How long does B takes to paint a room?

painter A:
6 hrs ---- 1 room
12 hrs --- 2 rooms

painters A and B:
4 hrs --- 1 room
12 hrs --- 3 rooms


so painter B:
12 hrs --- 1 room

[imacsg]

Can some help me the below question?

A number, when rounded off to the nearest hundred and nearest thousand, is 462 000. What is the biggest possible number? The answer should be 462 499 or 462 049.
Thanks

[MathIzzzFun]

imacsg:

Can some help me the below question?

A number, when rounded off to the nearest hundred and nearest thousand, is 462 000. What is the biggest possible number? The answer should be 462 499 or 462 049.
Thanks

Hi

462049 - this will round to 462000 to nearest 100 and to nearest 1000 whereas 462499 will round to 462500 to nearest 100 and 462000 to nearest 1000

cheers.

[blueymum]

Thanks Bluebelt for your detailed explanation

[blueymum]

Dear all


Would need help with these questions:

A baker has some flour. He uses an equal amount of flour to bake cakes everyday. After 6 days, he has 3/5 of the flour left. After another 4 days,he has 15kg of flour left. How much flour did he have at first?


Mary spent 1/4 of her money on shoes, 1/6 of the remainder on present and $45 on a blouse and had $80 left. How much money did she have at first?

Thanks all!!

[MathIzzzFun]

blueymum:

Dear all


Would need help with these questions:

A baker has some flour. He uses an equal amount of flour to bake cakes everyday. After 6 days, he has 3/5 of the flour left. After another 4 days,he has 15kg of flour left. How much flour did he have at first?


Mary spent 1/4 of her money on shoes, 1/6 of the remainder on present and $45 on a blouse and had $80 left. How much money did she have at first?

Thanks all!!

Hi

Q1.
Total amount of flour at first --> 15 units
2/5 used in 6 days --> 2/5 x 15 units = 6 units
1 day --> 1 unit
4 days --> 4 units
Amount of flour left in the end --> 15 -6-4 units = 5 units
5 units --> 15 kg, 1 unit --> 3 kg
Amount of flour at first = 15 x 3 kg = 45 kg

Q2.
5/6 of remainder --> $45 + $ 80 = $ 125
remainder --> 6/5 x $ 125 = $ 150 --> 3/4 of Mary's money at first
Mary's money at first = 4/3 x $ 150 = $200

cheers.