Operation Manual

42
60
55
50
45
40
35
30
25
20
15
10
11
12
13
14
16
17
18
19
21
22
23
24
90
80
70
F
U
E
L
L
B
S
.
L
I
T
E
R
S
.
O
I
L
L
B
S
.
I
M
P
G
A
L
.
G
A
L
.
U
S
.
55
50
N
A
U
T
.
45
40
35
30
25
20
15
10
90
80
70
11
14
16
17
18
19
21
22
23
24
S
T
A
T
.
K
M
.
1:10
1:20
1:30
1:40
1:50
2:00
2:30
3:00
3:30
4:00
4:30
5:00
6:00
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.