3. Share the following quantities in the given ratios:
(a) $20 in the ratio 1:4.
(b) 150 rubber bands in the ratio 3:7.
(c) 5.76 m in the ratio 7: 2.
(d) 80 millilitres in the ratio 5:3.
(e) $960 in the ratio 3: 5:4.
4.
In a rectangle the ratio of length to width is
3:1. What is the width of the rectangle if
its length is 12 cm?
5.
Two women share 60 curlers in the ratio
1:2. How many curlers does each woman
receive?​

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?