๐๐ผ30% of a number is 24. Calculate the original number.

๐๐ผSolve 5y^{2}-4y-1=0

๐๐ผDasha, 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?

๐๐ผA circle has an area of 120cm^{2} to the nearest 10cm^{2}. Calculate the upper bound of the radius.

๐๐ผIn the following Venn diagram, find the probability of A given B’: