how do u solve this?


Bin and Wei had some specimens of a butterfly. The ratio of the number of Bin’s specimens to the number of Wei’s specimens was 3:8. After Wei gave 8 specimens to Bin, he still had twice as many specimens as Bin. How many specimens did Bin have at first?

Thanks!

thanks all for your help!

sorry, i mean for qestion B. the balls question.

hi, these are P4 maths questions… is there a model that we can draw and understand?

can a maths guru help me?


HOw do i solve these?

1.There are twice as many men as women at a party. After 15 women had left the party, the number of men in th party was thrice the number of the remaining women. How many adults attended the party?

2. A big ball has a mass of 8kg and a small ball has a mass of 4kg. The total number of big and small balls is 56 and their total mass is 280kg.
a) How many big balls are there?
b) How many small balls are there?