Hello! :)
![\large\boxed{\text{70 seconds}}](https://img.qammunity.org/2021/formulas/mathematics/high-school/qvftjm2sop8l5b3wiaeut9i9qnxwwl7po8.png)
Use a proportion to find how many seconds are needed to fold 5 shirts.
We are given that he takes 28 seconds to fold 2 shirts:
28 sec : 2 shirts
We are not given the amount of time needed for 5 shirts, which we need to solve:
x seconds : 5 shirts
Express in a fraction:
![(2 shirts)/(28 seconds) = (5 shirts)/(xseconds)](https://img.qammunity.org/2021/formulas/mathematics/high-school/opiceghjqp3l7s5i3gg442kux7h1h0upjx.png)
Cross multiply and simplify:
![2 * x = 5 * 28\\\\2x = 140\\\\x = 70 sec](https://img.qammunity.org/2021/formulas/mathematics/high-school/abfib1ott17axmkuc84hk6hn8zc0f2r4g1.png)
Therefore, he needs 70 seconds to fold 5 shirts.