the unit's digit of a two digit number is 5 more than the ten's digit. The number it names is 5 less than 3 times the sum of digits. What is the number?
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let :-
B = A + 5 ____________1
10A + B = 3(A + B) ___________2
Substitute 1 in 2
10A + A + 5 = 3(A + A + 5)
11A + 5 = 3(2A + 5)
11A + 5 = 6A + 15
5A = 10
A = 2
Then we know that B is 5 more than that, so B
= 7.
num is 27.
7 is five more than the 2.
27 is three times what we get when we add the digits
======= (2 + 7 = 9).
thank you ☺ ♥
♪＼(*＾▽＾*)／＼(*＾▽＾*)／
let :-
B = A + 5 ____________1
10A + B = 3(A + B) ___________2
Substitute 1 in 2
10A + A + 5 = 3(A + A + 5)
11A + 5 = 3(2A + 5)
11A + 5 = 6A + 15
5A = 10
A = 2
Then we know that B is 5 more than that, so B
= 7.
num is 27.
7 is five more than the 2.
27 is three times what we get when we add the digits
======= (2 + 7 = 9).
thank you ☺ ♥
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