X+y=23
X-y=7.4
X+y=23
y=23-X
X-y=7.4
(23-y)-y=7.4
23-2y=7.4
-2y=-15.6
Y=7.8
X+y=23
X+7.8=23
X=15.2
Therefore the two numbers are 7.8 & 15.2
The number of natural numbers less than n is n-1.
Natural numbers are whole and positive numbers that are not 0.
If n is 2, there is one natural number less than n... and that is 1.
If n is 5, there are four natural numbers less than n... which are 1, 2, 3, and 4.
y=15
5y-20=2y+25 move terms
5y-2y = 25+20 calculate like terms
3y=45 divide both sides by 3
625/1000= 0.625
100/625= 0.16
5/8= 0.625
125/200= 0.625
20/125= 0.16
The first digit can be any numeral 1-9, while the second digit can be any of 0-9, so there are
such numbers. The third and fourth digits will mirror the second and third, respectively, so you only need to account for the first two digits.
