Question

The biology teacher has 59 tests to grade.

She grades 40 of the tests. Let t equal the number of tests she has left to grade. Choose the equation that will solve the problem.

OPTIONS-

t/40 = 59
40t = 59
t-40 = 59
t + 40 = 59

Answer 1

t + 40 = 59

Explanation:

We know

She has 59 tests to grade. So, it will be the total of the equation.

She already grades 40 on the tests.

t is the number of tests she has left to grade.

So, the equation is

t + 40 = 59