Directions (Q. 1-5): What value should come in place of question mark (?) in the following number series?
1. 124 215 342 511 ? 999
1) 695
2) 625
3) 728
4) 806
5) 573
2. 516 256 126 61 28.5 ?
1) 12.25
2) 16.75
3) 14.25
4) 20.20
5) 18.7
3. 7 21 50 109 ? 467
1) 198
2) 228
3) 372
4) 402
5) 275
4. 18 82 118 134 138 ?
1) 132
2) 198
3) 125
4) 138
5) 92
5. 5 22 103 406 ? 2422
1) 1516
2) 1298
3) 1136
4) 1602
5) 1213
6. A mixture of milk and water contains 7% water. What quantity of pure milk should be added to 12 litres of mixture to reduce water to 4%?
1) 5 litres
2) 6 litres
3) 7 litres
4) 8 litres
5) 9 litres
7. Two candles of the same height are lighted at the same time. The first is consumed in 6 hours and the second in 4 hours. Assuming that each candle burns at a constant rate, in how many hours after being lighted, was the first candle was twice the height of the second?
1) 3.5 hrs
2) 2 hrs
3) 4 hrs
4) 3 hrs
5) 2.5 hrs
8. Three friends Anil, Ravi and Sumit jog around a circular park and complete round in 21, 18 and 24 minutes respectively. In how many hrs will all the three meet again at starting point?
1) 8 hrs
2) 8.4 hrs
3) 6.5 hrs
4) 7.5 hrs
5) 9 hrs
9. With the help of the digits 1, 2, 3 and 4 find the sum of all 4 – digits numbers provided that the digits are not repeated.
1) 66,660
2) 6500
3) 40375
4) 100013
5) None of these
10. A, B and C can do a piece of work in 20, 30 and 100 days respectively. If A worked alone on the first day, B worked alone on the second day, C worked alone on the third day, A worked alone on the fourth day, and so on, then in how many days the work got completed?
1) 29 days
2) 28 days
3) 31 1/2 days
4) Can’t be determined
5) None of these