For every 3 euros there is 4 dollars, how much dollars will you have for 100 euros?

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

Find the value of x for which abcd must be a parallelogram -9-6x x-30

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