Suppose A,B,C have Rs.a,Rs.b,Rs.c respectively. If a:b=4:5,b:c=2:3 and a=800, find c.
a:b=4:5
⇒ab=45
We know that a=800
⇒800b=45
Cross multiply
⇒4b=40000
⇒b=400004
⇒b=10000
From the question b:c=2:3
⇒bc=23
We know that b=1000
⇒1000c=23
⇒c=30002
⇒c=1500