The gasoline tank and allison's car holds 12 gallons of gas on a trip the car used one fourth of a tank of gas if the tank was full at the beginning of the trip how many gallons of gas are left in the tank at the end of the trip

Just add 10+3m the m means the roman numeral m is often used to indicate one thousand, and mm is used to indicate one million. for example, an expense of $60,000 might appear as $60m. sales of $3,000,000 might be written as $3mm. internet advertisers are familiar with cpm which is the cost per thousand impressions. so 10+3m= 300,000,010hope this and if it does can i have brainlest? if not tell me what i did wrong but i’m pretty sure i am right.