Oliver starts with a number. First, he subtracts 5 from the number. Then, he multiplies the result by 4. His answer is 36.
Which one of the following expressions works out the number he started with?
36 x 4 - 5
36 = 4 - 5
36 = 4+5
36 + 5 = 4

Long division setup showing an incomplete calculation. 12 is in the divisor, 6839 is in the dividend, and 5 hundreds and 6 tens is written in the quotient. 6000 is subtracted from 6839 to give 839. an unknown value represented by a box is being subtracted from 839. what number should be placed in the box to complete the division calculation?