5less than the quotient of a number and -7 is twelve

First, write the problem as an equation.

The quotient of a number and :

less than:

is twelve:

Put it all together now:

Start by adding to both sides of the equation. Our goal is to get on one side of the equal sign and everything else on the other side:

Now multiply both sides by :

This means that the number equals .

he spend 5.1 minutes chatting with his friends.

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5.1

e.

step-by-step explanation:

because there are always 10 numbers in a phone number.