# 29 November

👉🏼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 $\frac{4}{5}$. The probability that Masha scores is $\frac{2}{3}$. The probability that Sasha scores is $\frac{3}{4}$. 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’: