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please thanks my answer and hope it will help you a lot.
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at first we will take the demonitions of Rs 10 as 10x and we will take the demonitions of Rs 5 as ( 90 - x) an according to the question the equation will be _
10x + 5 (90 - x) = 500
10x + 450-5x=500
10x-5x =500 -450
5x=50
x= 50÷5
x=10
so the demonitions of Rs 10 is 10 and the demonitions of Rs 5 will be let's put the value of x (90-10)=80 so this is the answer
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