The sum of two numbers is equal to thrice their difference. If the smaller of the numbers is 10 find the other number.
Let larger number be x and smaller number be y.
Also, y = 10
According to question,
⇒(x + y) = 3((x –y)⇒(x + 10) = 3(x –10)
⇒2x = 40⇒x = 20
Which number will fit in '?' place in the following series?
12, 23, 45, 89, ?
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