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in the absence of parentheses, you follow the order of operation, which is multiplication and division first , followed by addition and subtraction. The equation has two operations, one addition and one multiplication, so you have to do the 5 x 2 first and that gets added to the 10, so the correct answer is 20.how do you come to this answer?
lamp 10 + fan 5 x tent 2 is 30 in my maths class