Using model

Joe and Jason have $80 altogether. The amount of money Joe has is three times the amount of money Jason has. How much does Joe have?

A farmer has 120 horses and stallions altogether. The number of horses is 20 more than the number of stallions. How many stallions does the farmer have?

There are 45 apples in carton A and 55 apples in carton B. How many apples must be transferred from carton B to carton A so that the number of apples in carton A is 3 times the number of apples in carton B?

Alicia has $6 more than Betty. Betty has $10 more than Celia. The total amount of money they have is $116. How much money does Alicia have?

Alan, Benny and Charles have $240 in total. If Alan gives Benny $20 and Charles gives $15 to Benny, they will each have the same amount of money. How much money does Benny have at first?

Millie had 180 picture cards at first. She gave 1/9 of her cards to her best friend. She then gave 1/4 of the remaining cards to her cousin. How many picture cards had she left?

The Winnie and Patricia had an equal amount of money at first. After Winnie had spent $24 and Patricia had spent $72, Winnie had 3 times as much money as Patricia. How much money did each of them have at first?

Mandy and Sue had the same number of beads at first. Mandy gave her cousin 19 beads. Sue's friend gave her 23 beads. Sue then had 3 times as many beads as Mandy. How many beads did each girl have at first?

The reading corners in classes 3A and 3B have 152 books altogether. The number of books in the reading corner in class 3A is three times the number of books in the reading corner in class 3B. How many books are there in the reading corner in each class?

The sum of the ages of Jason and his younger brother is 15 years. If Jason's age is four times his brother's, how old is his brother?