Question
The speed of boat downstream and upstream is 28 km/hr
and 18 km/hr respectively. Time taken to travel a distance of (m + 35) km downstream and (n + 22) km upstream is 11 hours, and time taken to travel (m + 85) km upstream and (n + 65) km downstream is 17 hours. Find the difference between the value of m and value of n.Solution
According to question, (m+35)/28+(n+22)/18=11 (2m+70+3n+66)/56=11 2m+3n=616–136=480 … (iii) Also, (m+85)/18+(n+65)/28=17 (3m+255+2n+130)/56=17 3m+2n=952–385=567 … (iv) Solving equation (iii) and (iv), we get, m=105 and n=95 Therefore, required difference = 105 – 95 = 10
Find the missing number in the given number series.
2, 5, 11, 23, 47, ?418, 406, 430, 382, 478, ?, 670
1 12 31 58 93 ?
What will come in place of the question mark (?) in the following series?
92, 153, 220, ?, 364, 443
13 19 32 52 ? 113
250 Â Â Â 25 Â Â Â Â 5 Â Â Â Â ? Â Â Â Â 0.6 Â Â Â Â Â 0.3
10, 15, 25, 35, ?, 65
What will come in place of the question mark (?) in the following series?
2, 5, 14, 41, 122, 365, ?
4    11     22     ?      56    79    106
...48, 24.5, ?, 39.75, 81.5, 206.25, 621.75
