Answer:
a 1,2.3,4,8,12 i think thats all
4 x 7 is 28, and 8 x 7 is 56. You can use 4 x 7 to find 8 x 7 by multiplying that first and doubling that quotient.
Half of 56 is 28, therefore doubling that allows us to find the quotient of 8 x 7.
The problem is saying that 17/20 times the number of dollars equals the number of euros converted. Which in this case to solve your problem, 17/20 times one equals 17/20.
