ISRO Junior Personal Assistant 2008 Paper-II

The students in three classes are in ratio 2:3:5..1f 20 students are increased. in each class, the ratio changes to 4:5:7. What is the total number in the three classes before the increase?

A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and C in 198 seconds,all starting at the same point. After what time will they meet again at the starting point ?

‘Divide Rs.1540 among A, B, C so that A shall receive 2/9 as much as B and C together, and B 3/11 of what A and C togetherdo.

In a fort there is provision for 40 days for 275 persons.If after 16 days 125 persons leave the fort, for how many more days the provision will now last?

10 years ago, the average age of a family of 4 members was 24 years. 2 children having been born, the average of the family is same today. The present age of youngestchild if they differ in age by 2 yearsis:

A train travels 92.4 km/hr. How many metreswill it travel in 10 minutes?

A man covers a certain distance in 2 hours 45 mints., when he walks at the rate of 4 km/hr. How muchtime will he take to cover the same distance if
he runs ata speed of 6.5 km/hr.?

A number whendivided by the sum of 555 and 445 gives two times their difference as quotient.and 30 as the remainder. The numberis:

Which of the following will come in place of both the question marks in the following equations ?
$$\frac{128 + 16 \times ? - 7 \times 2 }{7^{2} - 8 \times 6 + ?^{2}}$$

$$80 \% 120 + 40 \%  of  150 = ?$$