Question

O
Decrease 40 by ratio of 4:5

Answer 1

A decrease in the ratio 4:5 implies that :

New quantity:Old quantity = 4:5

Let the new quantity be
`\bf \: x`

`\bf∴ x : 40 = 4:5`

`= > \bf (x)/(40) = (4)/(5)`

`\bf = > 40 * (x)/(40) = 40 * (4)/(5)`

`\bf = > x = 8 * 4`

`\bf = > x = 32`

So, the new quantity is 32