If three staff of Myschool Limited agreed to share their salary arrears in the ration of their ages, which are 18 years, 20 years, 22 years respectively. If the sum of the money collected is N120,000.00K, How much does the second staff received?

X and Y are two sets such that n(X) = 15, n(Y) = 12 and n{X ∩ Y} = 7. Find ∩{X ∪ Y}

Find the x and z intercepts of the graph of 3x - z \(\leq\) 9

Find the total surface area of a cylinder of base radius 5cm and length 7cm ( π = 3.14)