Question

Classes I, II and III with 50 students from each of the classes and 9 teachers are going on a trip. How many people are going to that trip in total?

• A. 100
• B. 450
• C. 159
• D. 59

Answer 1

The correct option is C 159

Number of students in each class = 50
Number of classes = 3 (Class I ,II and III)
Total number of students = $3\times 50$

In order to multiply by a number ending in zeros, we first need to multiply the number as if it didn't have zeros, and then we just write all of the zeros the number had, on the right of the final answer.

So, to find the value of $3\times 50$, we find $3\times 5$ first and then write a zero on the right of the result that is obtained.
We know, $3\times 5=15$.
So, $3\times 50=150$.

Number of teachers = 9

Total number of people on the trip
= Number of teachers + Number of students
= 150 + 9

1 5 0
+ 0 0 9
_______
1 5 9
_______

Therefore, total number of people on the trip is 159.