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your answer is 20 ( 10+5=15+5=20)
5 + n = 20======== ( and, in this case, means addition and is means equal )
20 + 5 = 25
It is: 5+15 = 20
The sum means the result of adding the numbers. Therefore the sum of 20 and 15 is 35. 5 times 35 is 175 - therefore 5 multiplied by the sum of 20 and 15 is 175.