exam Maths Puzzle Numerical Ability

Solve log lower case a (7x+1)=log lower case a (4x+16).

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exam Other Question

18? 8x-6

4y-10>-7y+33

Help!! How many washers can be made from a cube of metal 4 inches on a side if the washers are 5/8 inch in diameter and 1/6 inch thick?The hole in the center of the washers is 1/4 inch in diameter.