Grade 12 - More exercises : answers.
Rate, ratio and proportion.
1.1
R15 : R20
1.2
10 : 15 : 20
1.3
2760 : 11 040 : 20 700
2.1
37,8
2.2
4 590
2.3
65,5
3.1
10 minutes
3.2
13 km
4.1
R1 200
4.2
59
4.3
R870
5.1
12,954 km/litre | 7,719 litres/100 km.
5.2
277,216 km | 277,237 km
5.3
33,193 litre
6.1.1
100 cm = 1 m
6.1.2
1750 mm =
1,75 m
6.1.3
17,5 m
6.2.1
0,708 m =
70,8 cm
6.2.2
0,008 m =
8 mm
6.2.3
0,0252 m =
2,52 cm
mass
7.1
Volume is
directly proportional to mass because the rate -------------- stays the same.
volume
1 kg
1 000 g
3
7.2
The density of
water = -------------- = -------------- = 1 g/cm
1 liter
1 000 cc
3
7.3.1
115,8 g
7.3.2
21,4 cm
41,2 g
3
7.3.3
Density of
substance = --------------- = 17,167 g/cm and it
is smaller than the density of gold.
3
2,4 cm
The
ring is thus not made from pure gold.
3
7.4.1
11,35 g/cm
3
7.4.2
16 cm
7.4.3
90,8 g