Question

increase in her marks.
SAI
1
number increased by 22 -% gives 98. Find the number.
2.
hor decreased by 1957 gives 59.5. Find the number​

Answer 1

Step-by-step explanation:

1.Let the number be a

∴22.5%ofa=(

100

22.5

)×a

⇒a+(

100

22.5

)×a=98

⇒a+0.225a=98

⇒1.225a=98

⇒a=

1.225

98

=80

⇒a=80

2.Let the number be x.

twice =2x

When it is decreased by 7 we get the following equation:

2x−7=45

⇒2x=45+7

⇒2x=52

⇒x=

2

52

∴x=26

The number is 26.