Question

I need help with rato and proportions

Answer 1

I can explain ratios

Explanation:

ex. 1:2

Answer 2

b

Explanation:

given
`(m)/(a)` =
`(b)/(r)`

(a) is true

consider the numerical example

`(3)/(2)` =
`(6)/(4)` ⇔
`(2)/(3)` =
`(4)/(6)`

(b) is not true ( cross- multiply the original equation ) gives

mr = ab ⇒ (c) is true

(d) is true

using result from (c) divide both sides by a and m

`(mr)/(am)` =
`(ab)/(am)` ⇒
`(r)/(a)` =
`(b)/(m)`