I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

Count the number of triangles in the picture below:

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

Which city is three-fifths chick two third cat and 50% goat?

I taste better than I can smell. Who am I?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

What does below Rebus mean ?

esgg sgeg gegs gsge