My 3 digit number has a 4 in tha hundreds place. it has a greater digit in the tens place than in the ones place. the sum of the digits is 6

What is the ratio of the length of an object in yards to the length of the same object in miles?

I’ve been trying all day to figure this puzzle out. i need the work for it aswell. it is a factoring polynomials tarsia. the image is below.

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)