24 men can finish a piece of work in 18 days. 30 women can finish the same piece of work in 12 days. In how many days 16 men and 24 women together can finish the same piece of work
By formula, M1D1= M2D2
24M×18=30W×12
6M=5W
16M+24W = 16×5W/6+24W
=80W+144W/6=224W/6
According to question,
224W/6×d = 30W×12
d=9 9/14 days
79,39,19,9,4, ?
The respective ratio between the speed of the boat upstream and speed of the boat downstream is 2:3. What is the speed of the boat in still water if it covers 42 km downstream in 2 hours 20 minutes ? (in km/h)
17,9,10,16.5,35
71,78,92,120,?,288
1.5,2.5,7,24,100