exam Maths Puzzle Numerical Ability

An achitect is bulding a model of a bulding.How tall should the modle if the actual bulding is 175ft talll and the scale factor is 1:70

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A large grain silo is to be constructed in the shape of a circular cyclinder with a hemisphere attached to the top. The diameter of the silo is to be 30 feet, but the height is yet A 40% antifreeze solution and a 70% antifreeze solution is mixed to make 12 gallons of 50% antifrezze solution. How many gallons of each antifreeze solution should be used.