exam Maths Puzzle Numerical Ability

can someone please offer there intellegince?
16. Ricardo is 4 years less than twice as old as his sister. The sum of their ages is 20. How old is Ricardo?
A) 8
B) 10
C) 12
D) 14

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exam Other Question

wat does it mean or called when there is a number in the lower right hand corner or a a vairable or other number please tell me how to solve thanks use the inermediate value theorem to determine, if possible, whether g(x)=4x^3-3x+3 has a zero between -2 and -1.