exam Maths Puzzle Numerical Ability

Can you please help me solve this problem:

Three years ago, Rica was thrice as old as Dandy. Three years hence, she will be twice as old. Find their present ages.

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exam Other Question

Solve the Inequalities.

1. 4x-3≤17

2. 2y-9>5y+12

3. -8<3x+4<22

4. 3x-5<-11 or 2x-3>3 find the sum of the geometric series
6
[SUM] 2^n
n=1

n=1 2^1=2
n=2 2^2=4
n=3 2^3=8
n=4 2^4=16
n=5 2^5=32
n=6 2^6=64
2+4+8+16+32+64= 126

am I doing this correctly?