Answer:
A +7= F
Step-by-step explanation:
A is his current age, and he gains, or adds seven years he will be F or his future age.
a, c, d
1. a: 3/5=0.6=60%
2. c: 0.60=60%
3. d: 6/10=0.6=60%
Solutions: (-2. -6), (1, -2), (10, 3), (5, 3)