Question
The sum of three numbers is 136. If the ratio between
the first number and the second number is 2 : 3 and that between the second and the third number is 5 : 3, then the first number is:Solution
1. Let the three numbers be 2y, 3y, and 3z. 2. Since 3y = 5z, y = 5z/3 . 3. Substitute in the sum equation: 
4. Solving, the first number is 40.
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