A bag contains white marbles and blue marbles, 44 in total. The number of white marbles is 1 less than 4 times the number of blue marbles. How many white marbles are there?
Answers
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w + b = 44
w = 4b - 1
Now I see a couple of ways to solve this quickly using substitution.
1. Since w = 4b - 1, we can substitute 4b - 1 for w in the 1st equation.
(4b - 1) + b = 44
Combining like terms...
5b - 1 = 44
5b - 1 + 1 = 44 + 1
5b = 45
5b/5 = 45/b
b = 9
w = 4(9) - 1
w = 36 - 1
w = 35
2. Orrrrr, if we solve the first equation for w...
w = 44 - b
w = 4b - 1
Now, since w equals 44 - b and 4b - 1, they equal each other!
44 - b = 4b - 1
-5b = -45
b = 9
etc.
The first way is probably the way your teacher would show you, but either works for solving by substitution.
Answer:
रखिद के पिता की आयु
ररवद की आयु की 3 गुनी है पाँच वर्ष बाद दोनों की आयु योगफल १० वर्ष होगा दोनो की वर्तमान आयु ज्ञात कीजिए