SOLUTION: 1= what should come come in place of the question mark? 23% of 8040 + 42% of 545= ?% of 3000 Please solve with full detail 2= how many rotations will the hour hand of a clock

Algebra ->  Finance -> SOLUTION: 1= what should come come in place of the question mark? 23% of 8040 + 42% of 545= ?% of 3000 Please solve with full detail 2= how many rotations will the hour hand of a clock      Log On


   



Question 882660: 1= what should come come in place of the question mark?
23% of 8040 + 42% of 545= ?% of 3000
Please solve with full detail
2= how many rotations will the hour hand of a clock complete in 72 hours?
Please solve with full detail
3= the difference between 3/4th of 2/5th of the same number is 9. what is the number?
Please solve with full detail
4= Rs. 2010 are to be devided among A,B,C in such a way that if A gets Rs. 5 then B must get RS.12 and if B gets Rs. 4 then
C must get Rs. 5.50. the share of C will exceed that of B by?
Please solve with full detail
999
5= (999 ----- ×7) is equal to
1000
6= A 2 digit number is 3 times the sum of its digits. if 45 is added to the number, its digits are interchanged,
the sum of the digits of the number is ?
7= ( 1 1 1 1 1 ) is equal to
--- + --- + -- + -- + ---
1.4 4.7 7.10 10.13 13.16
8= There are sum boys and girls in a room.The square of the number of the girls is less than the squaqre of the no. of boys
by 28. if there were two more girls, the no. of boys would have been the same as that of the girls. the total no. of the
boys and girls in the room are?
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Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
%2823%2F100%298040%2B%2842%2F100%29545=%28X%2F100%29%283000%29
1849.2%2B228.9=30X
30X=2078.1
x=69.27
.
.
.
The hour hand makes one rotation every 12 hours.
72=12%2AN
N=6 rotations.
.
.
.
I think you mean 3%2F4 and 2%2F5 of the same number.
%283%2F4%29X-%282%2F5%29X=9
Multiply both sides by 4%2A5
15X-8X=180
7X=180
X=180%2F7%7D%7D%0D%0A.%0D%0A.%0D%0A.%0D%0A%0D%0A%7B%7B%7BA=5x
B=12x
C=3%285.5x%29=16.5x
.
.
.
A%2BB%2BC=2010
5x%2B12x%2B16.5x=2010
33.5x=2010
x=60
So then,
C-B=16.5x-12x=3.5x
C-B=3.5%2860%29
C-B=210