The sum of three consecutive numbers is 78, what are the numbers? using algebra (the first number is n)

x + (x+2) + (x+4) = 78 right?

but where does the 2 and 4 come from

If the flour ratio is 5 liters flour to 1 liter sugar, then how much sugar is needed if only 2 liters of flour are used. (Give answer as fraction)

Given f (x) = 4x + 6 and g (x) = - x + 9, find f (g (7)).

Alyssa is preparing her grocery list for the week. She wants to have a smoothie for breakfast every day and plans on a total of 6 cups of smoothies made from frozen fruit puree and yogurt. Knowing that fruit puree costs $2.

How much of other chemicals must be evaporated from 400 grams of a hand sanitizer that is 24% alcohol to strengthen it to a hand sanitizer that is 30% alcohol? Correct your answer to the nearest whole number.

The table below shows the number of minutes Morris practiced playing the trumpet during the past five weeks.

Which measures would be the side lengths of a right triangle?

Which expression is equivalent to the given expression? 19x-23x a 19 (x-23) b x (23-19) c 19x (1-23x) d x (19-23)

By selling a stool for rupees 67.50, a carpenter loses 10%. how much percent would he gain or lose by selling it for rupees 82.50.?

In Jim's class, 5 times as many kids take the bus as thos who walk. A total of 24 kids walk or take the bus. How many more kids take the bus than walk?

Franko's pizza is selling their pizzas 35% cheaper than usual. If a pizza normally costs $12.00, how much is it now? (show work)