SIMPLE EQUATIONS
EXERCISE 4.4
Set up equations and solve them to find the unknown numbers in the following cases:
(a) Add 4 to eight times a number, you get 60.
(b) One-fifth of a number minus 4 gives 3.
(c) If I take three-fourths of a number and add 3 to it, I get 21.
(d) When I subtracted 11 from twice a number, the result was 15.
(e) Munna subtracts thrice the number of notebooks he has from 50, he finds the
result to be 8.
(f) Ibenhal thinks of a number. If she adds 19 to it and divides the sum by 5, she
will get 8.
Answers
Answer:-
(a) Let the number be x.
According to question,
8x + 4 = 60
=> 8x = 60 – 4
=> 8x = 56
=> x = 56/8
=> x = 7
So, the number is 7
(b) Let the number by y.
According to question,
y/5 – 4 = 3
=> y/5 = 3 + 4
=> y/5 = 7
=> y = 7 * 5
=> y = 35
So, the number is 35
(c) Let the number be z.
According to question,
3z/4 + 3 = 21
=> 3z/4 = 21 – 3
=> 3z/4 = 18
=> 3z = 18 * 4
=> 3z = 72
=> z = 72/3
=> z = 24
So, the number is 24
(d) Let the number be x.
According to question,
2x – 11 = 15
=> 2x = 15 + 11
=> 2x = 26
=> x = 26/2
=> x = 13
So, the number is 13
(e) Le the number be m.
According to question,
50 – 3m = 8
=> -3m = 8 – 50
=> -3m = -42
=> 3m = 42
=> m = 42/3
=> m = 14
So, the number is 14
(f) Let the number be n.
According to question,
(n + 19)/5 = 8
=> n + 19 = 8 * 5
=> n + 19 = 40
=> n = 40 – 19
=> n = 21
Hope it's help you.....
Please mark me as brainlist.....