exam Maths Puzzle Numerical Ability

AT&T charges $30 after 250 minutes and $45 after 1000 minutes. Write an equation to represent the situation.

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A small firm produces both AM and AM/Fm car radios. The AM radios take 12h to produce, and the AM/FM radios take 20h. The production hours is limited to 300h per week. The plants c solve inequality qgraphically.
3x - y equal to or greater than 6
x " " 1
y " " 3