Question

Do ratios. 25 cm to 4 m and 30 sec to 6min form proportion? explanation

Answer 1

Answer:

25cm:1m

1m=100cm

=\frac{25}{100}=\frac{1}{4}=1:4

rs40:rs160=\frac{40}{160}=\frac{1}{4}=1:4

since the ratios are in proportion, therefore these are in proportion.

ii) 39litres:65litres=\frac{39}{65}=\frac{3}{5}

6bottles: 10bottles=\frac{6}{10}=\frac{3}{5}=3:5

since, the ratio are equal, therefore thee are in proportion.

iii) 2kg: 80kg\frac{2}{80}=\frac{1}{40}=1:4

25g:65g=\frac{25}{65}=\frac{1}{25}=1:25

since, the ratios are not equal, therefore these are not in proportion.

iv) 200ml:2.5ltres

\frac{200}{2500}=\frac{2}{25}=2:25

4: 250=\frac{4}{50}=\frac{2}{25}=2:25

sincce, the ratios are equal, therefore these are in proportion.

Answer 2

Answer:

Solution

a) 25cm/1m=25cm/100cm=1/4

`40Rs/160 Rs=1/4

They are proportionate

middle terms are 25 cm and 40 Rs

Extreme terms are 1 m and 160 Rs

b)39l/65l 39/65

6/10 bottles=3/5

They are not Proportionate.

c)2kg/80kg=1/40

25g/625g=1/25

They are not proportionate

d)200/2500=2/25

4/50=2/25

They are proportionate

middle terms are 200ml and 4Rs

Extreme numbers are 2.5litre and 50Rs.