3 cm tall object stands in front of a converging lens. Is desired that a virtual image three times larger than the object be formed by the lens. How far from the lens and centimeters meister object be placed to accomplish this task, if the final image is located 18 cm from the lens?

Two conductors, a and b, are each in the shape of a tetrahedron. but of different sizes. they are charged in the following manner: 1. tetrahedron a is charged from an electrostatic generator to charge q. 2. tetrahedron a is briefly touched to tetrahedron b. 3. steps 1 and 2 are repeated until the charge on tetrahedron b reaches a maximum value. if the charge on tetrahedron b was q/4 after the first time it touched tetrahedron a. what is the final charge qbmax on tetrahedron b?