Well, to start this off- you have three journals. Each one weighs 380 grams. To solve this you have to multiply the weight of each journal with the amount of journals you have. And your answer should be 840
Since each journal weighs 280 grams, and that there are three journals in total, you would multiply 280 by 3 in order to calculate how much grams the three weigh in total. 280 times 3 is 840. All three weigh 840 grams.
