<u>Solu</u><u>tion</u><u> </u><u>:</u><u>-</u>
Given that cost of each sandwich is AED 22 .50 .Also there is a delivery charge of AED 10 .
Also , it is given that total cost should be represented by t and sandwiches by s .
So , if one sandwich costs AED 22.50 .
Then , s sandwich will cost 22.50 × s = AED 22.50s.
Now , there is a delivery charge of AED 10 .
So , the total cost will be AED ( 22.50s + 10 ) .
And as per Question , it equals to t .
Hence the required equⁿ will be ,

2) If one sandwich costs AED 22.50 then 10 will cost 22.50 × 10 = AED225