exam Maths Puzzle Numerical Ability

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

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exam Other Question

The sixth grade class officers: president, vice president, secretary, and treasurer will be seated in a row of four chairs at the class meeting. In how many different ways may the four officers be seated?

Thank you so Much! Find the solution by substitution:
3x+8y=22
10x-2y=16