42
60
5
5
50
45
40
35
30
25
2
0
15
10
11
12
13
14
16
17
1
8
19
2
1
22
23
24
90
80
7
0
FU
EL
LB
S.
L
IT
E
R
S
.
OIL LBS.
IMP G
AL.
G
A
L.
U
S.
55
50
NAUT.
45
40
35
30
25
20
15
10
90
8
0
70
11
14
16
17
18
19
21
22
23
24
STA
T.
K
M
.
1:10
1:
20
1:3
0
1:
40
1:50
2:
00
2:30
3:00
3:30
4:00
4:
30
5:00
6:0
0
7:00
8:00
9:00
Ratios
Question
30 / 20 = 60 / x
Answer
Align “30” on the scale
to inner “20”. The answer
“40” (40) corresponds
to “60” on the scale. In
addition, the ratio of the
value on the scale to the
inner value is 30:20 at all
positions on the scales.
