biology vs chemistry

In a college 60 students enrolled in Chemistry,40 in Physics,30 in Biology and 15 in Chemistry and Physics,10 in Physics and Biology and 5 in Biology and Chemistry.No one enrolled in all the three.Find how many are enrolled in at least one of the subjects

Molecular biology is the study of

Assertion : Study of biology requires basic knowledge of chemistry and physics. Reason : Living organisms are made up of atoms and molecules which follow chemical and physical laws.

In how many ways can 4 different books, one each in chemistry, physics, biology and mathematics, be arranged on a shelf?

Seven books Math,English,Physics, Chemistry , Biology, Hindi, Histroy are arranged one above another. Only two books are placed above chemistry book. Only one book is placed between history and Biology as between box biology and math. Three boxes are placed between box English and physics. English is placed above physics. How many total numbers of books are placed in between book history and biology ?

Seven books Math,English,Physics, Chemistry , Biology, Hindi, Histroy are arranged one above another. Only two books are placed above chemistry book. Only two book is placed between history and Biology as between box biology and math. Three boxes are placed between box English and physics. English is placed above physics. Which book is placed immediately above biology ?

Seven books Math,English,Physics, Chemistry , Biology, Hindi, Histroy are arranged one above another. Only two books are placed above chemistry book. Only two book is placed between history and Biology as between box biology and math. Three boxes are placed between box English and physics. English is placed above physics. Which book is placed immediately above biology ?

Seven books Math,English,Physics, Chemistry , Biology, Hindi, Histroy are arranged one above another. Only two books are placed above chemistry book. Only two book is placed between history and Biology as between box biology and math. Three boxes are placed between box English and physics. English is placed above physics. Which of the following is true regarding English book ?