Math Reasoning Exercise: Set 3 - Questions 11 to 15
Question 11
Solve
Question 12
Chapter integers. Find A, B,C
Question 1:
We need to frame equations and solve. The equations are ….A+B =-1 A+C= -2 B+C=-7
To solve these equations.. you can either use algebra. or substitute suitable numbers
Lets add these equations A+B =-1 A+C= -2
A+B+A+C = -2-1
2A+B+C = -3.. Replace B+C with -7
2A + (-7) = -3
2A = +7-3
2A = 4…. A =2
Substitute value of A in other equations
2+B =-1 B = -1-2 = -3
2+C= -2 C =-4
Hence A =2, B=-3 and C=-4
Follow the same steps to solve question 2 and 3
Question 2 – A=1, B=4 C= 4
Question 3 – A=9 B =-21 C = 9
Question 13
Above is a sample sum.. now try sum on the right
The concept is factorization
What are the factors of 72?
72 = 1,2,3,4,6,8,9,12,18,24,36,72
Put these numbers and you can form a grid.
8x3x4, 4x3x6, 12x3x2