14
Q:
A) | B) |
C) | D) |
Answer: A)
Explanation:
Explanation:
Let the missing numbers be x, y, a and b
x + y = 8 ---- (1)
a - b = 6 ---- (2)
x + a = 13 --- (3)
y + b = 8 ---- (4)
2x + a + y = 21 --- From (1 & 3)
a + y = 14 ---- From (2 & 4)
Substitute (2 & 4) in (1 & 3)
2x + 14 = 21
2x = 7
x = 3.5
From (1) ---> 3.5 + y = 8
=> y = 8 - 3.5 = 4.5
a + y = 14 => a = 14 - y = 14 - 4.5 => a = 9.5
From (4) ---- y + b = 8 => b = 8 - y = 8 - 4.5 = 3.5
Hence,
x = 3.5
y = 4.5
a = 9.5
b = 3.5