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Instructions
What will come in place of the question mark (?) in the following questions ?
Solution
Expression : $$15 \div 12.5 \times 35 + 42.8 \times 2.5 =?^{2} + 10^{2}$$
=> $$\frac{15 \times 35}{12.5} + 107 = (x)^2 + 100$$
=> $$42 + 107 - 100 = x^2$$
=> $$x^2 = 149 - 100 = 49$$
=> $$x = \sqrt{49} = 7$$
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