Pooja

Pooja and Deepa's age is 4:5, and four years back, it was 8:11. What is the age of Pooja now?

Correct answer:

p =  12

Step-by-step explanation:


p = 4/5 · d
p-4 = 8/11 ·(d-4)

4d-5p = 0
8d-11p = -12

Pivot: Row 1 ↔ Row 2
8d-11p = -12
4d-5p = 0

Row 2 - 4/8 · Row 1 → Row 2
8d-11p = -12
0.5p = 6


p = 6/0.5 = 12
d = -12+11p/8 = -12+11 · 12/8 = 15

d = 15
p = 12

Our linear equations calculator calculates it.



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