For three numbers, the ratio of the first and the second numbers is 2 : 3 and that of the second and the third number is 4 : 5. If the sum of the three numbers is 140, then what is the second number?
first and second ratio =2:3
second and third ratio=Â 4:5
Second no. Ratio should be equal is both the caseÂ
To equal both the case multiply with 4and 3 respectively
$$2:3\times 4$$ =8:12
$$4:5\times 3$$=12:15
ATQ
sum of three =140
8x+12x+15x=140
35x= 140
x = 4
Second no. = $$12\times4$$
          = 48
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