book Maths Puzzle Numerical Ability

A ROOM MEASURES 3M BY 4M BY 7M.
THE WALLS NEED 2 COATS OF PAINT. A 4-L CAN OF PAINT COVERS 40M SQUARED.
HOW MUCH PAINT SHOULD TANYA BUY?
I KNOW THE ANSWER BUT NOT HOW I GOT IT.

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book Other Question

i have a examine and i'm scared i'll fail cause my teacher didnt teach me how to do ratios rates and frations Express the following as single logarithms, and if possible, simplify

a. Ln2x+3(Lnx-Lny)

b. 2/3[Ln(x^2-9)-Ln(x+3)]+Ln(x+y)

Convert to logarithmic notation:

x^3=-81