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2/5 of Jenna's stamps was equal to 1/4 of Anne's stamps. If Anna had 18 more stamps than Jenna, how many stamps did Jenna have?

find J

2/5* J = 1/4 * A

0.4J = 0.25A

0.4/0.25 * J=A      

1.6J = A                (1)

A=J+18                (2)

so

1.6 * J = J+18

0.6J=18

J = 18 / 0.6

J = 30

check

A=48

2/5*30=12        1/4*48=12  great   :)

Jenna had 30 stamps :)

Alot of d**n stamps,she must be jealous