Two capacitors (A,B), capacitor (A) is charrged throuh a potential difference (50volt) and capacitor (B) has a capacitance of (30mf) and is charged through a potential difference (20volt). After disconnecting the charging batteries, capacitors (A,B) are connected together in parallel, (positive plate to positive plate) and the common voltage is found to be(35volt). Find the capacitance(A) and the amount of transfered charge?