There are 156 , 208 and 260 students in group A , B and C respectively . Buses are to be hired to take them for a field trip . Find the minimum number of buses to be hired , if the same number of students should be accommodated in each bus and separate bus for separate group is needed.

A teacher wants to take 20 students to a park. He can take exactly 5 students at a time and will not take the same group more than once. Find the number of times that the teacher can go to the park

A teacher wants to take 20 students to a park. He can take exactly 5 students at a time and will not take the same group more than once. Find the number of times each student can go to the park.

In a group there are 21 childrens, 35 ladies and 49 gents. They all want to stay in same hotel. Find the minimum number of rooms required for their stay so that in each room equal number of members stay with the condition that children, female and male stay in separate rooms.

The number of students of Std. 6 and Std. 7 who went to visit the Tadoba Tiger Project at Chandrapur was 140 and 196 respectively. The students of each class are to be divided Into groups of the same number of student. Each group can have a paid guide. What is the maximum number of students there can be in each group ? Why do you think each group should have the maximum possible number of students ?

The number of students of Std. 6 and Std. 7 who went to visit the Tadoba Tiger Project at Chandrapur was 140 and 196 respectively. The students of each class are to be divided Into groups of the same number of student. Each group can have a paid guide. What is the maximum number of students there can be in each group ? Why do you think each group should have the maximum possible number of students ?

A teacher wants to take 20 students to a park. He can take exactly 5 students at a time and will not take the same group more than once. Find the number of times that a particular stadent can go to the park

There are 43800 students in 4 schools of a city. If half of the first, two -third of the second, three fourth of the third and four -fifth of the fourth are the same number of students, then find the ratio of number of students of A and D if A,B,C and D be the first, second, third and fourth schools respectively.

Two elements X and Y belong to groups 1 and 2 respectively in the same period. Compare them with respect to (a) the number of electrons in the outermost shell, (b) the number of valence electrons , (c) metallic character, (d) size of the atoms and ( e) formulae of the oxdies , hydrides and chlorides.