If 3 workers takes 6 days to complete painting a house, how many workers are needed if it needs 2 days to complete the job?

Thanks Tian Zhu

But the question specifically asked to figure out a formula…how?

Need help…

1) Figure out a formula that tells the sum of all the whole numbers between any 2 whole numbers. Show how you did it? What is the sum of all numbers between 1000 and 2000?
Thanks

Mychildren:

ttyh,


Draw 5 units each for everyone.
S u u u u u
D u u u u u
A u u u u u
S&D left was 2/5 of A
So out of 10 units from S&D, 8 units was spent -> 420+300 =720
1 unit -> 720/8 = 90
Ahmad has 5 units -> 90 x 5 = 450

Do double check with the rest whether same answer.

Thanks! I got 450 by using Algebra.

suhui, david and ahmad had the same amount of money each. Suhui spent $420 while david spent $300. The total amt of money suhui and david had left was 2/5 of the amt of money ahmad had. How much money did ahmad have?

Sorry, i can solve it by algebra but I need the method to be in models. Anyone? Thanks.

Hi,

Got a question from 2007 Rosyth paper.
Qn on State of matter -
A water puddle will only evaporate at 100 degree C - True or False?

Hi Teh

This topic of air volume in different containers has been debated for a while until I gave up.
Looks like you are stuck with the basketball now.
I guess I have to tell my kiddo that for all questions in P4 science on volume of air in whatsoever container, whether it is inflated, compressed, the volume is the same.
Hard to swallow, but no choice.

Zack7:

ttyh:

In what way is the large intestines and small intestines similar in terms of special features they have to facilitate absorption of materials?

intestines are folded in special ways to increase surface area for maximal absorption through diffusion.

Thanks. I just couldn't get this answer after googling...
I will wait for the answers back from the teacher.... :xedfingers:

In a digestive system, which organ will one find the sharpest drop in the amount of undigested food left? Why?

In what way is the large intestines and small intestines similar in terms of special features they have to facilitate absorption of materials?