Aclass of 195 students went on a field trip. they took 7 vehicles, some cars and some buses. find the number of cars and the number of buses they took if each car holds 5 students and each bus holds 45 students.

The number of cars is 3 and number of buses is 4

Solution:

Given that, a class of 195 students went on a field trip

Total number of students = 195

Let the number of cars be x

Let the number of buses be y

They took 7 vehicles, some cars and some buses

Therefore,

number of cars + number of buses = 7

x + y = 7 ------- eqn 1

Each car holds 5 students and each bus holds 45 students

Therefore, we can frame a equation as:

5 x number of cars + 45 x number of buses = total number of students

5x + 45y = 195 --------- eqn 2

Let us solve eqn 1 and eqn 2

From eqn 1,

x = 7 - y ------- eqn 3

Substitute eqn 3 in eqn 2

5(7 - y) + 45y = 195

35 - 5y + 45y = 195

40y = 195 - 35

40y = 160

y = 4

Substitute y = 4 in eqn 3

x = 7 - 4

x = 3

Thus number of cars is 3 and number of buses is 4

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.

its 60

4 x 12 = 48

3 x 4 = 12

48 + 12 = 60

yeeeet