book Maths Puzzle Numerical Ability

The sum of two numbers is 23. Twice the greater number added to three times the smaller number is 57. Find the numbers.

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book Other Question

Kyle weighs twice as much as his younger sister Suzanne and 10 pounds less than his older sister Margaret. All together they weigh 90 pounds. How much does Margaret Weigh. what is answer for -5/2t=-3/5