book Maths Puzzle Numerical Ability

A garage discovered that 1/2 of their customers bought french cars, 1/3 german cars and 1/6 (20) american cars. how many customers did the garage have?

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I'm really lost on how to do these.

Depreciation,solve the literal equation for the indicated variable.

D = c- S
______
N


(for s)


c-s then ___ under is
The Eath weighs about 5.974E21 metric tons. The sun weighs approximatley 1.99E27 metric tons. The sun weighs ?? times as much as the earth. Enter your answer with at least four dig