How many times can 1/6 go into 4

Which fraction below is equivalent to 10/12?

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%)

Hundred and tens tables to make 430 in five different ways