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Let the required number be x. According to question: When x is added to -26 we get 14. Therefore, x + (-26) = 14 x - 26 = 14 x = 14 + 26 = 40. So, 40 must be added to -26 to get 14.
-2x - 14 = 26 -2x = 26 + 14 x = -40/2 x = -20
Ans: 14 boys & 12 girls. Here's how: Assume x boys. So 26 - x girls. x boys & i rect per boy --- 4x sides; 26 - x girls & i tri per girl --- 3(26 -x) sides Hence, 4x + 3(26 - x) = x + 78 sides in all, and this = 92. So x = 14
It is 52
702 = 26 x 27; 210 = 14 x 15.