Answer :
Answer:
Step-by-step explanation:
(2/5)x + 42 = (4/7)x
(4/7 - 2/5)x = 42
(20/35 - 14/35)x = 42
(6/35)x = 42
x = 245 cm³
Answer:
Step-by-step explanation:
(2/5)x + 42 = (4/7)x
(4/7 - 2/5)x = 42
(20/35 - 14/35)x = 42
(6/35)x = 42
x = 245 cm³