Then 5/6 boys are 50 less than girls.
(3 14-50)/[ 1+(5/6)]
=264/( 1 1/6)
= 144 (human) boy
314-144 =170 (female)
2. What is left after A's work: 1-( 1/20)*4=4/5.
(4/5)/( 1/30)=24 (days)
3. Set the c x yuan
6x+ 180= 1.5*(5x+30)
1.5x= 135
x = 90°
90*( 1+5+6)= 1080 (yuan)
4.400*2/(280-240)=20 (minutes)
5. Ergonomics of (112) * 2 =1/6 b
1/[(112)+(1/6)] = 4 (days)
6. Work efficiency of both parties: (2/3)/4= 1/6.
The working efficiency of A is 1/8.
Ergonomics of B:1/6-1/8 =1/24.
1/( 1/24)=24 (days)
7. Working efficiency of Team A, Team B, Team C and Team III:1/2 * (1/6+1/4+1/8) =13/48.
A:13/48-1/4 =1/48 48 days.
B:13/48-1/8 = 7/48 48/7 days.
C:13/48-1/6 = 5/48 9.6 days.
8.2 minutes left
1-( 1/5+ 1/ 10- 1/ 15)*2==8/ 15
(8/15)/(1/5-115) = 4 (days)