The ratio 4:20 can be simplified if you divide both sides by 4. That gives you 1:5. 10:50 can also be simplified if you divide both sides by 10. That gives you 1:5. Since both simplify to 1:5, they are indeed equal
If you divide 4:20 by 4 on each side you would get 1:5 and if you divide 10:50 by 10 on each side you would get 1:5. 1:5=1:5 is equal, so yes 4:20 is equivalent to 10:50. Hope i helped :-)
