7/12=p/3,p=7/12*3=7/4,so it is 7/4.

Yeah you can. If you find a comon numeritor and put it in precentages then work it out it is faster and eiser.

Okay let me tell you how to solve this

you said that P is inversely proportional to R

that means P=X/R when P=7 and R=12 x for a variable

so,you can put the number instead of the variables Pand R

P=X/R

7=x/12

7*12=x finally X=84

now when R=3

P=84/R

P=84/3

P=28

so when R=3 you find that P=28

I hope that I helped

you said that P is inversely proportional to R

that means P=X/R when P=7 and R=12 x for a variable

so,you can put the number instead of the variables Pand R

P=X/R

7=x/12

7*12=x finally X=84

now when R=3

P=84/R

P=84/3

P=28

so when R=3 you find that P=28

I hope that I helped