Question

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Answer 1

Hey sup!

As per the question,

6). Let present age of Arvind's sister be x years.
So present age of Arvind = x+8 years.

So,
x+8+3=3(x+3).
=>x+11=3x+9.
=>3x-x=11-9.
=>2x=2.
=>x=2/2.
=>x=1.

So, present age of Arvind=x+8=1+8=9years.
Age of Arvind's sister=x=1years.

7). Ratio=1:2:3
Let the three angles be 1k,2k and 3k respectively.
Sum of angles of triangle is 180°
=>1k+2k+3k=180°
=>6k=180°
=>k=180°/6
=>k=30°

So the measure of angles are-:
1k=30°
2k=2*30°=60°
3k=3*30°=90°

Hope it helps.