# Lisa is 10cm taller than Ian. Ian is taller than than Jim by 14cm. Every month, all three grow 2cm each. In 7 months time, Ian's and Jim's combined heights will be 170cm greater than Lisa's. How tall is Ian?

##### 1 Answer

and just for fun:

#### Explanation:

Ok... word problems! The way to solve these things is to write down into math symbology what is written on the page. So let's do that.

First off we have Lisa and Ian. So I'm going to let

Ok - Lisa is 10 taller than Ian. So we can write that as:

Next sentence - and we have a new person, Jim (we'll let

With me so far? Good!

Every month,

Ok - so the amount that each of them grows in 7 months will be 14, because if it's 2 per month and it's 7 months,

And the question wants to know what Ian's height is.

To solve this, let's put the first two equations in terms of

Ok - we're all set.

and just for fun: