A book seller sells Mathematics and English books. If 30 customers buy Mathematics books, 20 customers buy English books and 10 customers buy the two books. How many customers has he altogether?

Similar Questions

Simplify: (11\(_{two}\))\(^2\) ...

Use the graph to answer the Question below What are the roots of the equation x2 + 3x - 4 = 0?...

Which of the following is a factor of 15 + 7x - 2x2...

The volume of a cuboid is 54cm3. If the length, width and height of the cuboid are in the ratio 2:1:...

Given, that \(4P4_5 = 119_{10}\), find the value of P...

To arrive on schedule, a train is to cover a distance of 60km at 72km/hr. If it starts 10 minutes la...

The difference between the length and width of a rectangle is 6cm and the area is 135cm². What ...

Find the solution of the equation x + 2\(\sqrt{x} - 8\) = 0...

The binary operation * is defined on the set of integers p and q by p*q = pq + p + q. Find 2 * (3 * ...

In the diagram above, |PQ| = |QR|, |PS| = |RS|, ∠PSR = 30o and ∠PQR = 80o. Find ∠SPQ....