Question

B had 30% as many stamps as C. C had 125% as many stamps as D. If D gave B 70 stamps, B would then have 50% of what C had. How many stamps did the 3 of them have altogether?

Answer 1

B = .3C
C = 1.25D
B+70 = .5C

We end up with

B = 105
C = 350
D = 280

Check:
B+70 = 175 = 350/2

SO, B+C+D=735

Answer 2

Thank you, Steve.