Question

8. The cost of 25 envelopes is $10.What is the cost of 10 envelopes ?

9. A train travels 360 km in 3 hours.How long will it take to travel 480 km ?​

Answer 1

Step-by-step explanation:

the cost of 25 envelopes is $10 then,

the cost of one envelope is $10/25=2/5,so

the cost of 10 envelope =$2/5*10 which is equal to $4

Hence, the cost of of 10 envelope is $4.