Inverse of Addition in an Algebraic Equation

Q. The sum of three consecutive numbers is 99. Find the smallest number.

1. 32
2. 34
3. 35
4. 33

Q. In the algebraic expression, $2x+1=3$, the value of unknown is

1. 1
2. 2
3. 3
4. 4

Q. In the algebraic equation $12+x=20$, the value of the unknown is

Q. Last year, the largest number of pizzas ordered in a month was the largest four-digit number while the smallest number of pizzas ordered in a month was the largest three-digit number. The difference between the largest and the smallest order is

1. 9000
2. 10998
3. 999
4. 1098

Q. On Jacky's street, the number of dogs is $12$ more than the number of cats. Jacky counted total $15$ dogs in his street. Number of cats in Jacky's street is

Q. I have got seven ribbons. I purchased three packets of ribbons, each containing $x$ number of ribbons. I currently have a total of 28 ribbons. Determine how many ribbons each packet contains.

1. 4
2. 5
3. 6
4. 7

Q. In the algebraic expression, $x+99=100$, the value of unknown is

1. 0
2. 1
3. 2
4. 3

Q. In Danny's class, the number of boys is $17$ more than the number of girls. Which of the following can not be the number of boys in the class?

1. $18$
2. $17$
3. $16$