walter needs to make at least 5 more cookies but no more than 40. 5 β€ x β€ 40
step-by-step explanation:
20 β€ x + 15 β€ 55
subtract 15 from all parts
20-15 β€ x + 15-15 β€ 55-15
5 β€ x β€ 40
this means how many more cookies he has to make
walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 β€ x β€ 40