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Mystery Number
Mixed Bag
100
Solve for x.

x + 2 = 5
x + 2 = 5 -2 -2 x = 3
100
a/7 + 10 = 17
What is 49?
100
Solve for x.

2x + 4 = 6
x = 1 2x + 4 = 6 - 4 -4 2x = 2 Divide each side by 2. 2 divided by 2 = 1.
100
The sum of the mystery number and 8 is 24.
n + 8 = 24
The mystery number is 16.
100
Simplify.

8 - 5(22 + 6)
-42
200
n - 18 = 47
n = 65
200
13x - 2 = 24
x = 2
200
Solve for x.

7x + 3 = 31
x = 4 7x + 3 = 31 - 3 - 3 7x = 28 Since x is being multiplied by 7, you must divide each side by 7. 28 divided by 7 = 4
200
The difference of the mystery number and 15 is 43.
n - 15 = 43
The mystery number is 58.
200
Identify the coefficients in the following expression:

2n - 12 + 4m + 8
2 is the coefficient of n, and 4 is the coefficient of m.
300
b + 41 = 23
b = -18
300
-8a +10 = 66
a = -7
300
Solve for z.

-3z - 7 = 23
z = -10 -3z - 7 = 23 +7 +7 -3z = 30 Since z is being multiplied by -3, you must divide each side by -3. 30 divided by -3 = -10
300
The product of the mystery number and -7 is 84.
-7n = 84
The mystery number is -12.
300
Simplify.

4(3x - 8)
12x - 32
400
Solve for x.

x ÷ 4 = 12
x = 48 Since x is divided by 4, we must do the opposite and multiply both sides by 4. 12 x 4 = 48
400
m ÷ -12 = -16
m = 192
400
Solve for x.

x⁄4 + 1 = 19
x = 72
400
The quotient of the mystery number and -4 is -12.
n ÷ -4 = -12
The mystery number is 48.
400
Evaluate for n = 2 and x = -4

2n + 3x - 8
-16
500
m ÷ -12 = -16
m = 192
500
5y - 11 = 49?
What is 12?
500
Solve for n.

-12.4 = -19.1 + n⁄-7.9
n = -52.93
500
3 more than twice the mystery number is 31.
3 + 2n = 31
The mystery number is 14.
500
Simplify.

-8m - 9(5 - 3m)
19m - 45