Book Maths Puzzle

a set of consecutive positive integers begining with 1 are written on a paper.one number is erased .the average of the remaining numbers is 35+(7/17).the erased no. is?
(a)10
(b)7
(c)12
(d)8

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Book Other Question

find the ratio x : y from the equation 20x-39xy+18y^2=0 Two supplementary anglesn differ by 44 degree. find the angles.