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A question bank has questions of Physics and Chemistry. The number of questions of Chemistry are 3.5 times the number of questions of Physics. If there are 90 questions in the question , bank find the number of questions of Physics and Chemistry in the question bank .

Most important question class 10 chapter 4 Quadratic equation

Chemistry plays an important role in our national economy. …………….

In a class test containing 10 questions, every correct answer is awarded 5 marks, every incorrect answer is awarded (-3) marks, and 0 marks are awarded for every questions not attempted. A student gets 4 questions right, 3 questions wrong, and leaves 3 questions unattempted. What is his score?

In a class of 175 students the following data shows the number of students opting one or more subjects Mathematics 100, physics 70, chemistry 28, physics and Chemistry 23, mathematics and chemistry 28 , mathematics and physics 30 , mathematics physics and chemistry 18. how many students have offered mathematics alone ?

class 10 exercise 8.4 question 4 part 1and2