71.

A tower is 50 m high. Its shadow is x metres shorter than the sun's altitude is 45° than when it is 30°. The value of x in metres is

• 50√3

• 50( √3 - 1 )

• 50( √3 + 1 )

• 50

The following pie-chart shows the study time of different subjects of a student in a day. Study the pie-chart and answer the following questions.

• 1 hour 30 min

• 2.9 hour (approx)

• 2 hours

• 3 hours

The following pie-chart shows the study time of different subjects of a student in a day. Study the pie-chart and answer the following questions.

If the student studied chemistry for 3 hours, then he/she studied geography for:

• 1 hour

• 2 hours

• 1 hour 30 min

• 2 hours 30 min

The following pie-chart shows the study time of different subjects of a student in a day. Study the pie-chart and answer the following questions.

If the student studied 10 hours in a day, then he/she studied mathematics for

• 3 hours

• 

• 

• 

The following pie-chart shows the study time of different subjects of a student in a day. Study the pie-chart and answer the following questions.

Instead of 10%, if the student spends 15% to study other subjects and the time is taken from the time scheduled to study mathematics and if he/she used to study 20 hours per day, then the difference of time for studying mathematics per day is

• 30 min

• 45 min

• 1 hour

• 1 hour 30 min