Question

Sharmila is a chemistry
teacher. She forgot to bring her time-table and
now wants to find out the schedule for XI-B. She
knows that there are four subjects taught
Physics, Chemistry, Mathematics and Biology - in
four consecutive periods of one hour each
starting from 9.00 a.m. At what time is the
Chemistry period scheduled?
Statements:
1) Mathematics period ended at 11.00 a.m, which
was proceeded by Biology.
II)Physics was scheduled in the last period
​

Answer 1

Answer:

Ans. both 1 and 2 are satisfied

1st statement says that 10 to 11 am is maths period and 11 to 12 pm is biology's period.

2nd statement says that Physics is the last lecture

so, chemistry will be the 1st lecture on 9:00 AM

Answer 2

Answer: Given:

• 4 subjects are there : Physics, Chemistry. Mathematics and Biology
• Periods are consecutive (One after the other)
• Periods are of one hour each starting from 9:00 a.m. So first period is from 9:00 a.m. to 10:00 a.m., second from 10:00 a.m. to 11:00 a.m., third from 11:00 to 12:00 and fourth from 12:00 to 1:00 p.m.

Find out:

At what time Chemistry period is scheduled?

Solution:

Statement 1: Mathematics period ended at 11:00 a.m. and period is of one hour

So timing for Mathematics period is from 10:00 am to 11:00

It is proceeded by Biology

Which means timing for Biology period is from 11:00 a.m. to 12:00 p.m.

Statement 2: Physics was scheduled in the last period

Which means timing for Physics period is from 12:00 p.m. to 1:00 p.m.

We can see from the given statements that only one time slot is left

i.e. 9:00 a.m. to 10:00 a.m.

and only one subject is left

i.e. Chemistry

So time scheduled for Chemistry period is from 9:00 a.m. to 10:00 a.m.