two number which product is 1800 and sum is 5
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Let one no be X
Other be X-5
Product of two numbers is 1800
(X) (X-5)=1800
X^2-5x=1800
X^2-5x-1800=0
X^2-45x+40x-1800=0
X(x-45)+40(x-45)=0
(x-45)(x+40)=0
X-45=0 or X+40=0
X=45or X=-40
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