exam Maths Puzzle Numerical Ability

Find the solution by substitution:
3x+8y=22
10x-2y=16

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exam Other Question

Please help!!!
Need to make long and short range missiles. Can't make more than 50 missiles and no more than 30 long range types. Spend 60,000 on short range and 90,000 on long Please help me with the following :

Find three consecutive even integers such that 6 times the first is 16 less than four times the sum of the second and third.

thank u