A birthday boy purchases four types of toffee to distribute it among his batch mates. The ratio of Alpenlibe, Kaccha mango, Eclairs, melody is 5 ∶ 7 ∶ 8 ∶ 9. If number of Alpenlibe is 30 less than Eclairs. Calculate the number of Kaccha mango?
1
90
2
50
3
80
4
70