Answer:
75
Explanation:
let the number of texts equal T
total amount charged by talk company - 15 + 0.1T
total amount charged by mobile service = 0.3T
we are to find the number of texts that would make the charges equal
15 + 0.1T = 0.3T
Collect like terms
15 = 0.3T - 0.1T
15 = 0.2T
T = 15/0.2 = 75