40 % of 1640 + ? = 35 % of 980 + 150 % of 850
Let 40 of 1640 + `x` = 35 % of 980 + 150 % of 850
Then, `x` = 35 % of 980 + 150 % of 850 - 40 % of 1640
=`(35/100 xx 980 + 150/100 xx 850) - (40/100 xx 1640)`
= (343 + 1275 - 656) = 1618 - 656 = 962.
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