Diana has already spent 600 minutes on the phone.

Question

She expects to spend 2 more minutes with every phone call she routes. In all, how many phone calls does Diana have to route to spend a total of 772 minutes on the phone?

Answer 1

Let x = number of calls

Total Minutes = Initial Minutes + Future Call Minutes

Total Minutes = Initial Minutes + numbers of calls x 2 mins/call

Plugging in Values

772=600+2x Subtract 600 from both sides

772-600=600+2x-600 Simplify

172 = 2x Divide both sides by 2

172/2 = 2x/2

x = 86 calls