Acomputer floppy disk has a mass of 20 grams how many do you need to have a total mass of 1 kilogram

Well,

1000 grams equals 1 kilogram. 1000/20 =50

You would need 50 floppy disks.

I hope this helps!!!

The second question is 3/5 or 0.6 and the third is 1/10 or 0.1. You need to make one into 10 pieces 10/10. Then subtract the known fraction from 10/10 which will give you a fraction. After that, divide the fraction in a calculator or by hand to find the decimal.