exam Maths Puzzle Numerical Ability

Ricardo is 4 years less than twice as old as his sister. The sum of their ages is 20. How old is Ricardo?

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exam Other Question

If a computer program draws aspiral at a reate of 45% every 20 seconds then how long will it take to complete 25 full turns? Suppose you have a perfectly spherical water tank with an inside diameter of 8.6 metres. If the drain at the bottom of the tank can't handle a hydrostatic pressure of more than 50