What's 17 out of 20 plus 7 out of 20
24 in 20, simplified 6 in 5 or 1 in 5
What's 1 in 15 plus 1 in 7
22/105
How many times seven eighths equals 15? How many times two thirds
It's three in two
2/3÷7/8=16/21 2/3÷15=2/45
Seven eighths times 16 / 21 equals 15 times 2 / 45 equals two thirds