Question

Tow numbers are in the ratio 4:5.if different of their cube is 61,find the number.

Answer 1

Let the first number be '4x'
Let the second number be '5x'
then, 
(5x)³-(4x)³=61
⇒125x³-64x³=61
⇒61x³=61
⇒x³=61÷61
⇒x³=1
⇒x=∛1
     x=1
   

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