A 500Km highway is to be constructed as per the plan, 27.5 km road was constructed per day in the first week. how many more km of the highway remains to be constructed? in approximately how many days will the work get completed if the construction progress at the same speed?
(it's a 7th grade question please provide step by step explanation because you know maths need explanation xD)
Answers
Step-by-step explanation:
this is the answer of your question
SOLUTION
(a) Let the fractionis nd , where d=3+n
n+5d+5=45
⇒5n+25=9d+20
5n+5=4d
5n+5=12+4n
n=7.
d=3+n
d=10
⇒710
(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 =50×518 m/sec
t=12×60 sec
S=50×518×12×60
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→550
12500 mens →550×125
=12.5 day
(H) 5 girls →4o days
1→4050
80→4080×80
=64
(I) S=ut=40×10=400
400=U×(8)
v=50km/h.