Tham khảo tài liệu 'new sat math workbook episode 1 part 4', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Verbal Problems Involving Fractions 45 3. FINDING WHOLE NUMBERS When a fractional part of a number is given and we wish to find the number representing the whole it is often easiest to translate the words into mathematical symbols and solve the resulting equation. Solution Norman buys a used car for 2400 which is 2 3 of the original price. Find the original price. 2 2400 5 x Multiply by 5. 12000 2x 6000 x Example The gas gauge on Mary s car reads 81 full. She asks the gasoline attendant to fill the tank and finds she needs 21 gallons. What is the capacity of her gas tank Solution 7 - of the tank is empty and requires 21 gallons to fill. 8 7 8 x 7x x 21 Multiply by 8. 168 24 Exercise 3 Work out each problem. Circle the letter that appears before your answer. 1. Daniel spent for a ticket to the movies. This 3 represents 4 of his allowance for the week. What did he have left that week for other expenses A B C D E 4. Mr. Rich owns 7 of a piece of property. If the value of his share is 14 000 what is the total value of the property A 70 000 B 49 000 C 98 000 D 10 000 E 35 000 2. 350 seniors attended the prom. This represents 7 9 of the class. How many seniors did not attend the prom 5. A 50 B 100 C 110 D 120 E 450 3. A resolution was passed by a ratio of 5 4. If 900 people voted for the resolution how many voted against it A 500 B 400 C 720 D 600 E 223 The Stone family spends 500 per month for rent. This is 15 of their total monthly income. Assuming that salaries remain constant what is the Stone family income for one year A 1875 B 6000 C 60 000 D 22 500 E 16 000 46 Chapter 3 4. SOLVING WITH LETTERS When problems use letters in place of numbers the same principles discussed earlier apply. If you are not sure which operations to use replace the letters with numbers to determine the steps needed in the solution. Example It takes Mr. Cohen X days to paint his house. If he works for D days what part of his house must still be
