how do open drains get choked

Write the algebraic expression for the following cases
a) sum of the squares of a and b
b) The sum of x,y,z subtracted from the product of x and y.
c) one-third of the sum p,q and r.
d) The product of a and c subtracted from the product of 5 and a
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Open drains can get choked if we throw plastic bag, oily substances and chemicals such as paints .
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open drains get choked due to physical activities done by human beings by throwing solid and non-biodegradable items such as plastic bags, chemicals such as paints,grease etc.
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