In a class of 80 students, every students had to study economics or geography, or both economics and geography, if 65 students studied economics and 50 studied geography, how many studied both subjects?

Similar Questions

If a rod 10cm in length was measured as 10.5cm, calculate the percentage error ...

Evaluate, correct to three decimal place \(\frac{4.314 × 0.000056}{0.0067}\)...

Express 2.7864 x 10-3 to 2 significant figures...

For what value of x is the expression \(\frac{2x-1}{x+3}\)not defined?...

Make u the subject of formula, E = \(\frac{m}{2g}\)(v2 - u2)...

The angle of a sector of a circle radius 10.5 cm is 48\(^o\). Calculate the perimeter of the sector....

When a number is subtracted from 2, the result equals 4 less than one-fifth of the number. Find...

Two chords PQ and RS of a circle when produced meet at K. If ∠KPS = 31o and ∠PKR = 42o, find ∠...

A man's initial salary is N540.00 a month and increases after each period of six months by N36.00 a ...

The variance of a given distribution is 25. What is the standard deviation? ...