exam Maths Puzzle Numerical Ability

please help me with this equation :)
4c+3(c-2)=-34

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exam Other Question

can you help?
1. 3/x = 7/5

2.5a^2b/12a multiplied by 2a^3b/15ab^6

The surface areas of two cubes are in the ratio of 49:81. If the volume of the smaller cube is 20, what is the volume of the larger cube?