Question

One day Lencho and his two sons were working on the field. Lencho heard the elder son shouting from the 8th row complaining about 12th plant being eaten by locust. A similar voice came from 2nd row of the field where his younger son found the 8th plant in the same condition. a) Find the distance between both the boys. b) If Lencho is standing somewhere between two boys dividing the distance into a ratio of 1 : 3. Find the position of Lencho.

Answer 1

Answer:

ANSWER

(a)

d

n

d=3+n

d=10

⇒

10

7

d+5

n+5

=

5

4

⇒5n+25=9d+20

5n+5=4d

5n+5=12+4n

n=7.

(b) m=4(s)

(m+16)=2(s+16)

⇒m+16=2s+32

4s+16=2s+32

2s=32

s=16

m=48

(c) G−VG=4

YG=4+B

YG+B=16

4+2B=16

2B=16

B=8

YG=12

G=16

(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+S and y

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

t=12

S=50×

18

5

×12

S=

3

500

m

(G) 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.