Schoolchildren 7938

There are 350 boys in the school, 56% of all schoolchildren. How many students are there at school, and how many girls are there?

Correct answer:

d =  275
n =  625

Step-by-step explanation:


350 = 0.56 n
350 + d = n

350 = 0.56·n
350 + d = n

0.56n = 350
d-n = -350

Pivot: Row 1 ↔ Row 2
d-n = -350
0.56n = 350


n = 350/0.56 = 625
d = -350+n = -350+625 = 275

d = 275
n = 625

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