There are 420 students in a school.if 40% of them are girls.find the number of girls and boys
2 answers:
Answer:
There would be 168 girls and 252 boys
Step-by-step explanation:
40% or 0.40 x 420 = 168
420 - 168 = 252
Answer: 252 Boys, 168 Girls
Step-by-step explanation:
420 would be 100% of the school students.
If you wanna find the number of girls, you need to divide 420/100 in order to get 1% and then multiply it by 40.
So then you would get
420/100 x 40 = 168
Then in order to get the boys just subtract 168 from 420
420- 168= 252
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Answer:
12
Step-by-step explanation:
n = 20
d = 6
a = 4
L = a + (n - 1)*d
L = 4 + (20 - 1)*6
L = 4 + 19*6
L = 118
Sum = (a + L)*n/2
Sum = (4 + 118) * 20/2
Sum = 122 * 10
Sum = 1220
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