1st grade and 2nd grade school kids every year send letters to Santa and receive christmas gifts from him.
Last year 1st graders send 4 letters more than 2nd graders. This year 1st graders sent 2 letters more than last year.
And 2nd graders this year send twice as less letters than 1st graders send in total.
How many gifts received each class every year if Santa send them 87 gifts in 2 years?
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