Please help, please and thank you

1. Each car on a commuter train holds 20 people. On a particular morning, 5 cars were 90% full and 3 cars were 65% full. If the people were rearrenged to fill as many cars as possible, how many cars would be filled?

2. Use each of the digits 1,2,4,5,8, and 9 once to creat the greatest possible value of the following expression. The mixed numbers have to be in proper form, without being renamed.

( ) ( )/3-( ) ( )/6+7 ( )/( )