PLease help m 1.Water was added to aqueous solution of a certain salt with concertation of 20%, which resulted in a 20% mass increase of the solution Part of the water was then evaporated from the resulting solution and its mass decreased by 20%. What is the current concentration of this solution?
2.The height of the isosceles trapezoid ABCD from the vertex D of the obtuse angle divides the longer base into sections AE and EB of 3 cm and 13 cm respectively. The triangle AED is isosceles. Calculate the area of the trapezoid ABCD
3.In the first half of their match against Range Hill School, Boarwarts Academy scored all of the points. In the second half, each side scored three points.

At the end of the match, Boarwarts Academy had scored 90% of the points.

What fraction of the points were scored in the second half?