exam Maths Puzzle Numerical Ability

I need help solving these two problems on Radicals:
1. Radical 18 + Radical 12 + Radical 8 =
2. 3 radical 7 - 2 radical 28 =

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a local dairy has two kinds of milk. The first contains 3% fat and the second contains 4.5 % fat. how much of each kind of milk are needed to make 150 gallons of milk having 4% fa Jamar rides his bike 41 miles a weekmore than Micah. Together , Jamar and Micah ride a total of 93 miles a week. How many miles does each ride in a week?