What does this rebus means ?

PROG WORKRESS

Decode this picture on T-Shirt and tell what it says ?

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 know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

What is the below Rebus indicate?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

What country can make you shiver?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?