Lời Giải
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Kevin is 6 years older than Timothy, but 4 years ago Kevin was twice as old as Timothy. Find their present ages.solve and show solution : If a card is selected at random standard deck of card, what is the probability that the card drawn is red card or face cardTwice the hiệu between a number and 4 is equal to three times the sum of the number and two.The sum of 3 consecutive odd integers is 213. What is the value of the least integer?Jack invested 5,000 for 4 years at a simple interest rate of 7%. How much interest did he earn?