Lesson #27 answers
In-class exercise answers:
1).
Q + N = 20
25Q + 5N = 480
N = 20 - Q
25Q + 5(20 - Q) = 480
25Q + 100 - 5Q = 480
20Q = 380
Q =
19
quarters
2).
T + F = 12
3T + 5F = 44
F = 12 - T
3T + 5(12 - T) = 44
3T + 60 - 5T = 44
-2T = -16
T =
8
3-petal flowers
3).
T + C = 150
10T + 3C = 660
C = 150 - T
10T + 3(150 - T) = 660
10T + 450 - 3T = 660
7T = 210
T =
30
tables
4).
B + T = 17
2B + 3T = 42
T = 17 - B
2B + 3(17 - B) = 42
2B + 51 - 3B = 42
-B = -9
B =
9
bicycles
Homework answers:
1).
N + U = 51
U = 2N
U = 51 - N
51 - N = 2N
51 = 3N
N =
17
new cars
2).
D + B = 32
D + 2B = 48
D = 32 - B
32 - B + 2B = 48
B =
16
bactrian camels
3).
C + W = 120
C = 7W
W = 120 - C
C = 7(120 - C)
C = 840 - 7C
8C = 840
C =
105
correct answers
4).
S + F = 32
6S + 4F = 152
F = 32 - S
6S + 4(32 - S) = 152
6S + 128 - 4S = 152
2S = 24
S =
12
tables for 6
Practice competition #1 (number sense) answers:
1). 72
2). 8125
3). 870
4). 17
5). 7/10
Practice competition #2 (measurement) answers:
1). 31,536,000
2). 435
3). 4200
4). 440
5). 100