book Maths Puzzle Numerical Ability

find the value of sin4A and cos4A

Read Solution (Total 0)

book Other Question

Hi, If I had a bag of marbles containing 5 green, 3 Blue and two red marbles. What is the probability of drawing the following marbles at random:

A red?
A red and then a green How many liters of 8%, 10% and 20% solutions are needed to make 8L of a 12.5% mixture if the 8% solution is 2L more than the 20% solution?