4 गेंद या कलमो का मूल्य ₹ 12 हो तो 6 गेंद और 6 कलमो का मूल्य बताइए​

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.

For the inequality |c| < |d| to be true, which of the following must be true?

How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid in order to get a 40% solution of acid?