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To enable them think logically, and be meticulous.
Using set theory let A contain the students who failed mathematics (50) and B contain the students that failed English (30). Now set A and B intersect so they share the same students (5). Therefore the students who passed both subjects is the complement of the union of the sets. ~(AUB)=~(A+B-AintersectB)=100-(50+30-5)=25 students.
Mathematical is a science, it is fundamental to all other 'sciences'
mathimatics is important in our daily lifes because it is important.
They had a symbol for zero and understood its importance in mathematical calculations.