such pu
Exercise 70
Frame equations for the following.
a 6 times a number added to 10 is 58.
b A number decreased by 10 is 40.
C A number increased by 8 is equal to 48.
d A number is 4 times another number. Their sum is 30.
e A number is 8 times another number. Their difference is 42.
f Half of a number is 21 less than twice the number.
g Cost of a book is twice that of a pen. The pen and the book together cost * 48.
2 Express in words the meaning of the following equations.
a a + 3 = 6
b 12 - x = 8
c m = 27
8
New Enjoying Mathematics 7
Answers
Answer:Let the number be x (for every ques)
(you can also take any variable instead of 1.10+6x=58
2.x-10=40
3.x+8=48
4.4x+x=30
5.8x-x=42
rest do your self.
1. number a added to 3 gives 6.
2.a number x subtracted from 12 gives 8
3.8 times m is 27.
Thank You
Step-by-step explanation:
Answer:- a) 6×a+10=58
So, 6×a=58-10=48
Therefore, a=48/6=8Ans
Answer:-b) x-10=40
So x=40+10=50Ans
Answer:-c) x+8=48
so, x=48-8=40Ans
Answer:-d) x+4x=30
so, 5x=30
x=30/5=6Ans
Answer:-e) 8x-x=42
so, 7x=42
x=42/7=6Ans
Answer:-f) 1/2x=2x-21
so, 2x-1/2x=21
on solving above equation we get...
3x=42
x=42/3=14Ans
Answer:-g) Let cost of pen be xRs
so, cost of book will be 2xRs
Total cost of both
2x+x=48
3x=48
x=48/3=16Ans
2(a) Three more a number is equal to six.
2(b) Eight more a number is equal to twelve.
2(c) a number is equal to 27 .