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Of the four numbers whose average is 91, the first is 3/10 times the sum of other three. The first number is :1). 1262). 563). 1684). 84 |
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Answer» Let the first number be x. x = (3/10) × (sum of other three SIDES) Therefore, sum of other three sides = (10/3) × x Average = Sum of four sides/4 Average = (x + sum of other three sides)/4 Therefore, Average = (x + 10x/3)/4 Since average = 91 91 = (13x/3)/4 x = (91 × 12)/13 x = 84 Therefore, the first number is 84. |
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