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elena-14-01-66 [18.8K]
3 years ago
14

10. Mary's father is four times as old as Mary. Five years ago he was seven times as old. How old

Mathematics
1 answer:
Harrizon [31]3 years ago
7 0

Answer:

Mary is 10 years old, and her father is 40 years old.

Step-by-step explanation:

Let Mary's age = x.

Mary's father is four times as old, so he is 4x.

Five years ago, Mary was x - 5, and her father was 7(x - 5).

Five years ago, Mary's father was 4x - 5.

7(x - 5) = 4x - 5

7x - 35 = 4x - 5

3x = 30

x = 10

4x = 4 * 10 = 40

Mary is 10 years old, and her father is 40 years old.

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