Question

Answer the following questions.

Answer 1

Step-by-step explanation:

1•let the number be 'x'

x+x 15/100=161

= x+3x/20=161

= 20x+3x/20=161

= 23x/20=161

= 23x=161×20

= 23x=3220

= x=3220/23

= x=140

2•let the number be 'x'

x-x × 20/100=192

=x-x/5=192

=5x-x/5=192

=4x/5=192

=4x=192×5

=4x=960

=x=960/4

= x=240

3•Given that,length of the wire is 72cm

and it is stretched to 90cm

the percentage of length increased=difference of the stretched and actual lengths of the wire by actual length of wire into 100

=90-72/72 ×100

=18/72 × 100

=1/4 × 100

=25%

percentage of length increased of the wire = 25%

4• Given that the value of a car in 2009 =$20000

in 2010 the value is decreased by 20% and in 2011 it is decreased by 10% of the value in 2010.

the value of car in 2010=$20000-20% of 20000

=20000-4000

=16000

the value of car in 2011= 16000- 10% of 16000

=16000-1600

=14400

Therefore the value of a car in 2011 =$14400

It is very useful to you mark me as a brainliest....and follow me yar..