Hi,

So finally I started studying for my GMAT which I will take in summer.

I began with

Manhattan GMAT 2007 (Number properties) as it was suggested on the forum. My first question is about exponents.

On page 51, the MGMAT says the following:

5^1 = 5

5^2 = 25 Increased by 20

5^3 = 125 Increased by 100

5^4 = 625

Increased by 500Now, my primary language is not English but why is 5^4 (aka 625) increased by 500?

Why can't we say that it increased by 620? I mean that why can't we start counting from the 5^1?Also, in Russian there are two ways how to say the number has increased:

a. Arithmetically

b. Geometrically

In the example of 5^4 compared to 5^1, we can say that

a. 5^1 has increased by 620 arithmetically (that is 620 has been added)

b. 5^1 has increased by 125 geometrically (that is 5 has been multiplied by 125)

However, English language does not specify when somebody says that "Number A has increased by B". Naturally, I start thinking that a geometrical progression is being used. Nevertheless, I found out that by default the expression "Number A has increased by B" means the addition of the B.

So, what are the common ways for GMAT to ask questions when multiplication (and not addition) is involved?Thanks.

_________________

If the post is helpful, kudos appreciated!