Grade 5 math problem: there are 28 boys in class 5 (2), 4 more than girls. How many of the boys are in the class?

Number of girls = number of boys - 4 = 28-4 = 24
According to the percentage in the question: (Boys / class) x 100% = (Boys / (boys + girls))) x% = 28 / 52 x 100% = 0.538 x 100% = 53.8% (it is stipulated in the textbook, except that it is not reserved to the thousandth place)

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