Answer :

4r=10q/P I do believe
P=10(q-3r)/r
(r) (r)
Pr=10(q-3r)
/10 /10
Pr/10=q-3r
+3r +3r
Pr+3r/10=q
(10) (10)
Pr+3r=10q
/P /P
r+3r= 10q/P
4r=10q/P

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