I prefer to stay here. If I see them biting away another cotton candy stick,I will turn green and sicken in the po.If they haven’t had a dozen apiece I will eat it myself from rain rain go away chp class 8
Answers
Answer: (a) Let the fractionis
d
n
, where d=3+n
d+5
n+5
=
5
4
⇒5n+25=9d+20
5n+5=4d
5n+5=12+4n
n=7.
d=3+n
d=10
⇒
10
7
(b) m=4(s)
(m+16)=2(s+16)
⇒m+16=2s+32
4s+16=2s+32
2s=16
s=8
m=4s=32
(c) G−YG=4
YG=4+B
YG+B=16
4+2B=16
2B=12
B=6
YG=4+B=10
G=14
(D) F+S=54
(F−6)=2+4(S−6)
F−6=2+4S−24
F=4S−16
4S−16+S=54
5S=70
S=14
F=40
(E) S=2A
A = 5 + Sandy
sandy+S=16
Sandy +2A=16
Sandy +10+2 sandy=16
Sandy=2
S=14
A=7
(F) S=ut
v=50km/h =50×
18
5
m/sec
t=12×60 sec
S=50×
18
5
×12×60
S=10000m=10km
(G) Since the number of men engaged and the number of days taken to do a piece of work are in inverse variation, we have:
50 mens →5 days
1→
50
5
12500 mens →
50
5
×125
=12.5 day
(H) 5 girls →4
o
days
1→
50
40
80→
80
40
×80
=64
(I) S=ut=40×10=400
400=U×(8)
v=50km/h.
Explanation: