The sum of two numbers is 21. Five times the first number added to 2 times the second number is 66. Find the two numbers.​

The mean of 10 values is 19. if further 5 values areincluded the mean becomes 20. what is the meanthese five additional values? a) 10b) 15c) 11d) 22

How many 3/8s are in 6 plz someone tell me now

In 2014, the three largest economies in the world were (listed in order, from largest): a) the u.s., china, germany. b) the u.s., china, japan. c) china, the u.s., japan. d) china, the u.s., germany.