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EACH BOY IN A GROUP OF BOYS GIVES A GIFT TO EVERY OTHER BOY IN THE SAME GROUP.IF THE TOTAL NUMBER OF GIFTS IS 132,HOW MANY BOYS ARE THERE IN THE GROUP? |
| Let x be the number of boys. Then x (x - 1)=132 x2 - x -132 =0 (x - 12)(x +11) = 0 x = 12 or x = -11 |
