If 40% of a number is equal to two-third of another number, what is the ratio of first number to the second number ?
A. 2 : 5
B. 3 : 7
C. 5 : 3
D. 7 : 3
A. 2 : 5
B. 3 : 7
C. 5 : 3
D. 7 : 3