NIMCET 2011 Question Paper with solutions

Question : 53 of 120

Marks: +1, -0

At a dance party a group of girls and boys exchange dances as follows.
One boy dances with 5 girls, second boy dances with 6 girls, and so on last boy dances with all girls. If

b

represents the number of boys and

g

represents the number of girls, then

$b=g$
$b=g / 5$
$b=g-4$
$b=g-5$

Validate

Solution:

Suppose number of boys

=b

1 st boy dances with 5 girls

(1+4=5)

2nd boy dances with 6 girls

\{2+4=6

)
3rd boy dances with 7 girls

(3+4=7)

∴

both boy dances with

(b+4)

girls
Hence,

g=b+4

⇒ \;\; b=g-4

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