Exam Maths Puzzle Numerical Ability Algebra

20 men can plant 50 saplings in 8-hours. In how many hours can 15men plant 80
saplings?

Read Solution (Total 2)

Exam Other Question

Suppose y varies inversely as X and Y = 5 when x = 20. Find x when y = 2 3x-4y=7
2x-y=3

then
3x-4y=7
-8x+4y=-12

adding

-5x=-5 then x=1 then 3-4y=7 then 4y=-4 then y=-1
Solution: x=1,y=-1