exam Maths Puzzle Numerical Ability

Find three consecutive even integers so that 7 times the third is equal to 20 less than the first.

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exam Other Question

I need to solve this system of 4 equations using Guassian Elimination and have only solved 3 equation systems using GE. Can you show me the steps for the 4 equations? x + y + 2z When the problem states "the sum of," I know it means to add, but what does it mean "the sum of the square of a"? And what are the other names for add, subtract, divide & muiltiply? Is there w website that has this inforrmation?