Question 1163258
that's a good start
multiply the first by 15 to clear fractions
6A=10B
3A=5B. then A=(5/3) B, to bring a fraction back which can be more easily substituted.
A+B=4800
(5/3)B+B=4800. (5/3)+B is (5/3)B+(3/3)B, common denominator. They add to (8/3)B
(8/3)B=4800
B=4800*3/8=$1800
A=$3000

2/5 s of A is $1200
2/3s of B is $1200