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There are five ways to get a sum of 70 with two prime numbers: 3 + 67 = 70 11 + 59 = 70 17 + 53 = 70 23 + 47 = 70 29 + 41 = 70.
There are 8!/(4!*4!) = 70 ways.
8 ways
Use two theory The sum of the angles of a triangle is always 180 and An the base angles of an issceles triange are equal therefore if one angel is 70 then the two combinations of the angles woudl be 70 - 70 - 40 making 40 the smallest angle 70 - 65 - 65 making 65 the smallest angle
Since 1% of 7000 is 70, multiply 70 by 3 (making 210) - then subtract that from the initial 7000, giving the answer 6790