book Maths Puzzle Numerical Ability

The sum of two integers is greater than 12. One integer is ten less than twice the other. What are the least values of the integers?

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5-3(x+1)=5 Radioactive element R DECAYS EXPONENTIALLY AT A RATE OF #5 PER YEAR. iF WE BEGIN WITH 5 GRAMS OF R., HOW LONG ( TO THE NEAREST TENTH OF A YEAR) WILL IT TAKE FOR ONLY 3 GRA