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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