Question

[PHONG LÊ NGỌC]

2.     Adeline and Mandy had some money in the ratio 3:7. After Adeline received $90 and Mandy received $40, both girls had equal money. How much money did they have at first?

Answer 1

[Pencil]

Mandy have more than Adeline:

90 - 40 = 50 ("money unit")

At first, Adeline had:

50 : (7 - 3) x 3 = 37,5 ("money unit")

At first, Mandy had:

50 : (7 - 3) x 7 = 87,5 ("money unit")

Answer: Adeline: 37,5 "money unit"

              Mandy: 87,5 "money unit"