1.

Find the missing number:12+85/?=?

Answer» 12 + 85/X = x

12 = x - 85 / x

12 =( x {}^{2}  - 85) \div x
x {}^{2}  - 12x - 85 = 0

x {}^{2}  - 17x + 5x - 85 = 0

x(x - 17) + 5( x - 17) = 0

(x + 5)(x - 17) = 0

x =  - 5 \:  \:  \:a nd \:  \: 17


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