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Anuta_ua [19.1K]
3 years ago
13

Sonu's grandmother is 80 years old and Sonu is 20 years old. how many years ago was his grandmother 7 times as old as Son? (line

ar equations in one variable)​
Mathematics
1 answer:
Aleks [24]3 years ago
6 0

Answer:

10 years ago

Step-by-step explanation:

Let x be the number of years ago

x years ago,

Sonu's grandmother was 80 - x

Sonu was 20 - x

x years ago,

the grandmother was 7 times as old as Sonu

80 - x = 7(20 - x)

80 - x = 140 - 7x

6x = 60

x = 10

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