Solving Electrostatics Problems: Contact of Neutral & Charged Spheres

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The problem involves two insulated metal spheres, one neutral (X) and one charged (+1.80 E -16 C, Y). Before contact, the total charge of the system is 0 C. After the spheres are brought into contact and then separated, the total charge remains +1.80 E -16 C. Sphere X retains a charge of 0 C, while sphere Y maintains a charge of +1.80 E -16 C after separation. Understanding these charge interactions is crucial for solving similar electrostatics problems.
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Hi, i have been assigned a series of problems that basically follow the same pattern, but I am unable to solve the first one which is making it difficult to solve the others.

here it is

An insulated metal sphere (X), that has no net charge (neutral), is brought into contact with a similar sphere (Y) that has a charge of +1.80 E -16 C. The two spheres are the separated. a) What is the total charge of the system before and after separation? b) What are the charges of spheres X and Y after seperation?

thanks
 
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!a) Before separation, the total charge of the system is 0 C. After separation, the total charge of the system is +1.80 E -16 C. b) After separation, sphere X has a charge of 0 C and sphere Y has a charge of +1.80 E -16 C.
 

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