Por un kilo y medio de merluza se ha pagado 21,30 €. A cuanto estaba el kilo?

Can someone me i’m confused. will give brainliest and a whole bunch of points

The length and width of a rectangle are consecutive even integers the area of the rectangle is 120 squares units what are the length and width of the rectangle

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)