Answer:
i) Boys:1200; Girls:2000
Boys:37.5%; Girls:62.5%
Step-by-step explanation:
i) Boys: 3200*(3/8) =1200
Girls: 3200-1200 =2000
ii) Boys: (1200/3200)*100%= 37.5%
Girls: 100%- 37.5%= 62.5%
Not sure sorry but you can. Try searching on google or yahoo answers
Mentally your dividing the 12.50 by 10 and then thats 1/10 of it.
1st problem:
Use the Pythagorean theorem:
a^2+b^2=c^2
49+361=c^2
c^2=410
c=20.24
The answer is 20m
2nd problem:
First calculate the height using the Pythagorean theorem:
a^2+b^2=c^2
20^2+b^2=625 (i got 20 {radius} by half-ing the base edge length)
400+b^2=625
b^2=225
b=15
Next, solve for the volume:
V=a^2*h/3
V=40^2*15/3
V=1600*5
V=8000
The answer is the second choice or B.