I had a lot of trouble with these two questions can someone help?

george spent 25% of the moeny he had on lunch and 60% of the rmaining money on dinner. if he then had 9 dollars left, how much money did he spend on lunch and dinner?

For what set of values of x is the expression Absolute value sign 3x+4 absolute value sign < 0 true?

a) -4/3 < 0<x
b)x<-4/3
c) no real numbers
d)all real numbers

3 answers

started with $x
spent .25x, leaving .75x
spent .60*.75x = .45x
so, he spent a total of .70x
.30x = 9, so he spent (.70/.30)*9 = $21

You want |3x+4| < 0
now, come on -- you know that absolute values are never negative.
So, no solutions
where did you get .70?
.70 = .25 + .45
the amounts he spent