STD 10th maths exercise 3.5

solve the following pair of equations by cross multiplication method

3x + y = 5
5x + 3y =3

The heaviest 16% of all men in weight weigh more than how many pounds ?

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.

What is the circumference of a circle with an area of 50.24 cm²?