👉🏼In 2016 the average waiting time for an operation was 15 days. By 2020 it had been reduced to 15 days. Calculate the percentage decrease.

👈🏼At a concert there are men, women and children, such that men and women are in the ratio 5:7 and children and women are in the ratio 2:3. If there are 800 people at the concert, then how many women are there?

👆🏼If a CD costs £6.79, calculate without a calculator the cost of 5 CDs.

👇🏼Show the following data on a Venn diagram: ξ = { positive integers under 30}, A = { primes under 30}, B = { 2, 6, 7, 8, 9, 11, 15, 18, 21, 27}

🖐🏼Use the Venn diagram to calculate P(A∩B)