If 55\(_x\) + 52\(_x\) = 77\(_{10}\) find X

Simplify \(7\frac{1}{12}-4\frac{3}{4}+2\frac{1}{2}\)

Evaluate \(\frac{81.81+99.44}{20.09+36.16}\) correct to 3 significant figures.

A man bought a second-hand photocopying machine for N34,000. He serviced it at a cost of N2,000 and then sold it at a profit of 15%. What was the selling price?

A student spent 1/5 of his allowance on books, 1/2 of remainder on food and kept the rest for contingencies. What fraction was kept?