40% of k liters of acid are added to 60% w liters of water

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.

The sum of 5consecutive even numbers is 100. what is the first number in this sequence?

Let x = a + bi and y = c + di and z = f + gi. which statements are true?