R=16
J=32
20+40(which is 20×2)=60
20-4=16
16×2=32
I would suggest looking up a converter chart, I don't know all of them but I can help with some.
For yards to feet you have to divide by 3 because there are 3 feet in a yard.
For lbs, it's 16 oz in a pound, so divide by 16.
For miles to yards you divide by 1760 because there are 1760 yards in a mile.
I hope this helps a little bit.
Answer:
51 seconds
Step-by-step explanation:
23.08+27.92=51.00