👉🏼30% of a number is 24. Calculate the original number.

👈🏼Solve 5y²-4y-1=0

👆🏼Dasha, Masha and Sasha each take a penalty. The probability that Dasha scores is . The probability that Masha scores is . The probability that Sasha scores is . What is the probability that all three miss?

👇🏼A circle has an area of 120cm² to the nearest 10cm². Calculate the upper bound of the radius.

🖐🏼In the following Venn diagram, find the probability of A given B’: