<human>:  A phone factory makes twice as many phones as last year. Last year’s production was 5000 phones. If a quarter of this year’s production is sold, how many phones are left in the factory?
<bot>: How many phones are made this year? ** This year’s total production is 5000 * 2 = <<5000*2=10000>>10000 phones.
How many phones are sold? ** A quarter of this year’s production is 10000 / 4 = <<10000/4=2500>>2500 phones.
How many phones are left? ** The number of phones left after selling a quarter of the production is 10000 – 2500 = <<10000-2500=7500>>7500 phones.
#### 7500