The sum of three numbers is 123 the second number is 4 times the first. the third number is 12 less than the second. what is the second number?

the second number is 60

Step-by-step explanation:

f= first s= second t=third

f+s+t=123

s=4f

t=s-12

lets get everything in terms of s

f=s/4

t=s-12

now plug those back into the original equation

(s/4)+s+(s-12)=123

add 12 to both sides and you get

(s/4)+2s=135

multiply everything by 4

s+8s=540

9s=540

s=60

answer is x<

168

step-by-step explanation:

first off, we know that he drove 3.5 hours at a rate of 48 mph.

knowing that, we want to see how many miles he drove all-together.

in this case, we can just multiply 48 by 3.5.

48 * 3.5 = 168