In a class of 50 students, 40 students offered Physics and 30 offered Biology. How many offered both Physics and Biology?

Ablock of wood is a cube whose side is x in. long. you cut off a 1-inch thick piece from the entire right side. then you cut off a 3-inch thick piece from the entire top of the remaining shape. the volume of the remaining block is 2,002 in3. what are the dimensions of the original block of wood?

What is 140% of 25? because i need

What number is 7 units left of -15?