A grocer sold 45% of his stock of sugar and the quantity that he sold was 96 kg less than the quantity left how much sugar did he sell

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

Ineed with math stuff it involves graphs