Responding to a pm:

How to resolve the following:

Number x has increased by 100% ??

Number x has increased by a factor of 20 ??

Number x has an increase of 100% ??

Number x has increased to y ??

Number x has increased by y ??

Solutions:

Number x has increased by 100%

x has increased by 100% of x i.e. x has become double of what it was originally.

If x was 10, it is now 20.

Number x has increased by a factor of 20

"increased by a factor of 20" means "multiplied by 20" (yes, kind of un-intuitive because I might expect it to INCREASE by 20x to become 21x but that is not the way it is used)

So x becomes 20x

Number x has an increase of 100% ??

Not usually used. We use "x has increased by 100%". It means x has becomes 2x.

Number x has increased

to y ??

x has become y. Number of children (which has 5) has increased to 10 (now there are 10 children).

Number x has increased

by y ??

y is added to x to give x + y. Number of children (which was 5) has increased by 10 (now there are 15 children).

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Karishma

Veritas Prep | GMAT Instructor

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