Simplify $2\sqrt{3}-\frac{6}{\sqrt{3}}+\frac{3}{\sqrt{27}}$

The table shows the number of pets kept by 30 students in a class. If a students is picked at random from the class . What is the probability that he/she kept more than one pet?

Given that $\frac{{{5}^{n+3}}}{{{25}^{2n-3}}}={{5}^{0}}$ , find n

An empty rectangular tank is 250cm long and 120 cm wide. If 180 litres of water is poured into the tank, calculate the height of the water.

Solve the inequality  $3(x+1)\le 5(x+2)+15$

Given that $T=\{x:-2<x\le 9\}$ where x is an integer . What is n(T)

The sum of 6 and one –third of x is more than twice x. Find x

Given that $P=\{x:1\le x\le 6\}$ and $Q=\{x:2<x<10\}$ , where x is an integers. Find $n(P\cap Q)$

A casting is made up of Copper and Zinc. If 65% of the casting is Zinc and there are 147g of Copper. What is the mass of the casting?