Two types of rice costing Rs.135 per kg and Rs.125 per kg are mixed in the ratio 2:3. In what ratio third type of rice costing Rs 75/kg should be mixed to sold the mixture at the rate of Rs.105/kg​

Imagine a new pasture with grass growing on it. every day after the seeds have germinated, the number of blades of grass in the pasture triples. after 18 days, the entire pasture is completely covered in grass. how many days did it take for the pasture to be one-third covered in grass?

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm

Math i have no idea how to do a and b