If the average of a and b is 45, and the average of b and c is 35, then (a-c)=?
If the average of a and b is 45, and the average of b and c is 35, then (a-c)=? Correct Answer 20
a + b = 2×45; b + c = 2×35so a + b - b - c = 2(45 - 35)a - c = 2×10 = 20
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Feb 20, 2025