Cooghan asked his 19 classmates whether they were right or left-handed. there were 5 more right-handed classmates than left-handed classmates.

the balance is found at the link

step-by-step explanation:

4 puzzles in 3 hours

step-by-step explanation:

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.