Question

in a computer class 40 students 60% are boys 25% of the boys and 50% of the girls are using portable computers the rest are using desktop computers how many students are using desktop computers

Answer 1

If 60 percent are boys, than there are 24 boys since 0.6 * 40 = 24. There are also 16 girls since 40 - 24 = 16. If 25 percent of the boys are using portables, than 24 * 0.25 = 6 boys are using portables. If 50 percent of the girls are using portables than 16 * 0.5 = 8 girls are using portables. Therefore, 6 + 8 = 14 people are using portables. Since we are looking for how many are using desktops, we do 40 - 14 to get that 26 kids are using desktops.