Book Maths Puzzle

5,?,15,75,525,4725

Read Solution (Total 2)

4725/525=9;525/75=7;75/15=5;15/x=3;x/5=1 descending odd nos. so x=5
10 years agoHelpfull: Yes(3) No(0)

5,5,15,75,525,4725
5(*1)=>5
5(*3)=>15
15(*5)=>75
75(*7)=>525
525(*9)=>4725
10 years agoHelpfull: Yes(2) No(1)

Book Other Question

Abbot can do some work in 10 days, Bill can do it in 20 days and Clinton can do it in 40 days. They start working in turns with Abbot starting to work on the first day followed by Bill on the 2nd day and by Clinton on the 3rd day and again by Abbot on the fourth day and so ontill the work is completed fully.find the time to complete the work fully. The speed of the boat in the still water is 15km/h. It takes 4 hr 30 minutes to travel 30 km down the stream and back to the starting point. Find the speed of the stream.