10) an object has mass of 50g 500mg and 0.1g. express the total mass of the object in grams

500 mg in g :

1 g 1000 mg
? 500 mg

500 x 1 / 1000 => 0.5 g

total mass:

50 g + 0.5 g + 0.1 g => 50.6 g

hope this helps!

North atlantic current or north atlantic drift is the answer