Jacob can create an app in 24 hours, but if he works with a friend, they both can create the app in 16 hours. how long would it take his friend to create this app alone?

48 hours

Step-by-step explanation:

Given that,

number of hours Jacob takes to create an app = 24 hours

number of hours both takes to create an app = 16 hours

To find,

number of hour Jacob's friend takes to create an app = x hours

Jacob create 1/24 part of app in an hour

Jacob's friend create 1/x part of app in an hour

Take reciprocal

24x / (x + 24) = 16

24x = 16 (x +24)

24x = 16x + 384

24x - 16x = 384

8x = 384

x = 384/8

x = 48

step-by-step explanation:

ok so im not 100% sure but you would start by adding 5.1t and 1.9t beacuse they have the same variable. that is 7t.   then add -3.6 + 1.2 which is -2.4

so then keep that as -2.4 + 7t. i apologize if this is incorrect. best luck on your test < 3