Thank you so much!

Hi! Here is a hint. Change 1/3 to 5/15 and 2/5 to 6/15. (Common denominator) If you see the increase from 5/15 to 6/15, this increase is also equivalent to the 12 red ribbons bought by Jillian. :) You can now solve for the total ribbons. :)

3802?

Or 3912

Or 3192 or 3082

Answer is 3912, any kind soul to advc what are the steps / model to derive the answer pls, thanks! :)

You can use trial and error/ guess and check table for the ten and hundred placing.

Hi! First, deduct 2/9 from 1 to get what Ali and Xiuling eat in total. That would be 7/9. What 2 fractions, when added, give a total of 7/9? At the primary 2 and 3 level, it would be the following for Ali and Xiuling respectively: 1/9 and 6/9 2/9 and 5/9 3/9 and 4/9 or 1/9 and 6/9; 2/9 and 5/9; 3/9 and 4/9; for Xiuling and Ali respectively. At the primary 4 and 5 level, change the fraction 7/9 to 14/18. Find 2 fractions that have a sum of 14/18. To go further, change 7/9 to 21/27, 28/36 or any equivalent fraction. The possibilities will become endless. :)

You have to assume that they were sharing the nine pieces and not cut it further to infinite number of pieces. Also, you could use the number bonds technique for the visualization too.

I still don't understand

Hello??

I hope the abv clarifies

Hi! Refer to the image below for an explanation.:)

Which part you don't understand?

How you get the units

2u & 3u understand ?

I don't understand 2u

40% = 2/5

How about the other units

3u × 3 = 9u can get it?

27u

9u is 25% so 75% is 27u get it?

Yes

So which part you still don't understand?

No more , thks