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Workbook

1. Determine whether the number 2,7 and 5,3 are proportional to the numbers 8,1 and 15,9

2. Are the number 48 and 18 proportional to the numbers 24 and 9?

a c 3a c
3. If   2 and  k then find k.
b d 3b d

4. If a, b and c proportional directly as 4, 5 and 10 in that order and a+c=42. Find b.

9 1
5. a) If V proportional directly as R and V  when R 1 , write the formula for V in terms of R.
3
2 2

b) If S proportional inversely as the square of L, and S=20 when L=3, write a formula for S in terms
of L.

6. a) If the number of days required to do a job proportional inversely as the number of men working,
and 6 men can do the job in 14 days, how long would it take 8 men to do the job?

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