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Sum of a number and its half is 30 then the number is ……..(a) 15(b) 20(c) 25(d) 40 |
Answer» (b) 20 Let number be x half of number is x/2 Sum of number and it’s half is given by x + x/2 = 30 [Multiplying by 2 on both sides] 2x + x = 30 x 2 3x = 60 x = 60/3 = 20 |
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