R5exS5Elearapb R5exS5Elearapb

03-02-2016
Mathematics

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A mother's age is three less than three times her daughter's age. The sum of their ages is 45. What is the daughter's age?
A) 33
B) 12
C) 42
D) 15

Respuesta :

taskmasters taskmasters

03-02-2016

Given:
mother's age = 3x - 3
daughter's age = x
total of their ages = 45

Mother's age + daughter's age = 45
3x - 3 + x = 45
4x = 45 + 3
4x = 48
4x/4 = 48/4
x = 12 daughter's age. CHOICE B.

mother's age : 3x - 3 = 3(12) - 3 = 36 - 3 = 33

To check:
mother's age + daughter's age = 45
33 + 12 = 45
45 = 45

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