Answer:
[tex]Needed = \frac{9}{20}kg[/tex]
Step-by-step explanation:
Given
[tex]Needed\ Flour= 1kg\ \&\ \frac{1}{4}kg[/tex]
Required
How much flour he add to [tex]\frac{4}{5}kg[/tex] to get the desired amount
We start by adding 1kg to 1/4kg
[tex]Total = 1kg+ \frac{1}{4}kg[/tex]
Take LCM
[tex]Total =\frac{4 +1 }{4}kg[/tex]
[tex]Total = \frac{5}{4}kg[/tex]
Next, we subtract the [tex]\frac{4}{5}kg[/tex] from the above total
[tex]Needed = \frac{5}{4}kg - \frac{4}{5}kg[/tex]
Take LCM
[tex]Needed = \frac{25 - 16}{20}kg[/tex]
[tex]Needed = \frac{9}{20}kg[/tex]
Hence; He needs [tex]\frac{9}{20}kg[/tex]amount of flour
