1) 228 - 12 = 216 ÷ 6 = 36 per book
2) 15 - 6 = 9 × 2 = 18 weekly allowance
3) 17 - 6 = 11 x 2 = 22 comic books
4) 1st number = n ; 2nd number = n + 1 ; 3rd number = n + 2
n + n + 1 + n + 2 = 84
3n + 3 = 84
3n = 84 - 3
3n = 81
3n/3 = 81/3
n = 27 1st number; smallest number
5) 15 + 6x = 39
6x = 39 - 15
6x = 24
6x/6 = 24/6
x = 4 hours
6) 1st even no. = n ; 2nd even no. = n + 2 ; 3rd even no. = n + 4
n + n + 2 + n + 4 = 162
3n + 6 = 162
3n = 162 - 6
3n = 156
3n/3 = 156/3
n = 52 smallest number
7) 265 - 7 = 258 ÷ 6 = 43 students per bus
8) 4 + 4x = 16
4x = 16 - 4
4x = 12
4x/4 = 12/4
x = 3 cost of each candy bar
9) 39 x 2 = 78 - 9 = 69 cards Dan started with
10) 1st odd no. = n + 1 ; 2nd odd no. = n + 3 ; 3rd odd no. = n + 5
n + 1 + n + 3 + n + 5 = 117
3n + 9 = 117
3n = 117 - 9
3n = 108
3n / 3 = 108/3
n = 36
1st odd no. = n + 1 = 36 + 1 = 37 smallest number.