(a)[2]
Simplify the expression $6a - 3b + 2a - 4b$.
(b)[1]
Expand the expression $5(x - 3)$.
(c(i))[1]
Solve the equation $\frac{x}{3} = 18$ for $x$.
(c(ii))[2]
Solve the equation $5x + 18 = 8$ for $x$.
(c(iii))[2]
Solve the equation $12x - 3 = 4x + 21$ for $x$.
(d)[1]
Given $6^{10} \times 6^{x} = 6^{2}$, find the value of $x$.
(e)[5]
Find the adult-ticket price and the child-ticket price.