20. the ratio between the present ages of p and q is 6 : 7. If q is 4 years old than p, what will be the ratio of the ages of p and q after 4 years?
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Answer:
Step-by-step explanation:
p:q::6:7
q=p+4
therfore, p/p+4=6/7
Cross Multiplying ....
7p=6p+24
therfore, p=24 After four years p=28
therfore, q=(p+4)=(24+4)=28 After four years q=32
(After four years)p/q=28/32=7/8
therefore, p:q::7:8
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