Answer :
[tex] \frac{3}{5} *7kg = \frac{3*7}{5} kg= \frac{21}{5} kg=4 \frac{1}{5} kg=4.2kg[/tex]
Well OF means to MULTIPLY
So Ur pretty much looking at it like this: 3/5 x 7
You have to do 7 times the numerator, (which is 3)
7 times 3 is 21.
Now we have 21/5
So 21/5 is the answer