1397 x 1397 = ? Here what replaces '?'

Correct Answer: 19

Explanation:

17 4 7 + 13 2 12 - ? = 11 2 3

123 7 + 158 12 - ? = 35 3

=>  ? = 123 7 + 158 12 - 35 3

=> ? =  1476 + 1106 - 980 84

=> ? = 19.07

Correct Answer: 40

Explanation:

Let ? = p

38 x 7500/100  + p x 375/100 = 50 x 6000/100

=> 38 x 75 + 3.75p = 3000

=> 3.75p = 3000 - 2850

=> p = 150/3.75 

=> p = ? = 40

Correct Answer: Rs. 20

Explanation:

Let the Oranges be 'O', Bananas be 'B' and Apples be 'A'

From the given data,

 

2O + 3B + 4A = 15 ...... (I)

3O + 2B + A = 10 ..... (II)

On adding (I) and (II),

5O + 5B + 5A = 25

O + B + A = 5

4O + 4B + 4A = 20.

Correct Answer: 90

Explanation:

3/5 of  350 - 4/7 of 210 = 210 - 120 = 90.

Correct Answer: 6

Explanation:

$$\begin{gathered} ? 2 = 2 × 7 8 - 21 + 8 + 49 - 14 8 \\ = 57 - 21 \\ = 36 \\ = > ? = ± 6 \end{gathered}$$

Correct Answer: 10 47/60

Explanation:

The given equation is in Mixed fraction.

Now to solve this type of fractions,

$$\begin{gathered} 4 1 3 + 2 1 5 + 4 1 4 = ? \\ ? = 4 + 2 + 4 + 1 3 + 1 5 + 1 4 \\ ? = 10 + 47 60 \\ ? = 10 47 60 \\ \end{gathered}$$

Correct Answer: 25

Explanation:

a+b=5   ...(1)    and    3a+2b=20 ...(2)

 

Multiplying (1) by 2 and subtracting from (2), we get : a=10.

 

Putting a=10 in (1), we get : b=-5

 

Therefore,   (3a+b) = 3 x 10+(-5)=30-5=25.

Correct Answer: 4

Explanation:

Given that  3 x - y = 27,  3 x + y = 243

? 3 x - y = 3 3 , 3 x + y = 3 5

 => x-y=3, x+y=5

 => x = 4

Correct Answer: 26

Explanation:

Let, Hema attempted 'k' sum correctly, then

k x 3 -2 x(35-k) = 60
5k = 130
k = 26

so 26 correct sums.

Correct Answer: 80578

Explanation:

217 2 + 183 2

 

= 200 + 17 2 + 200 - 17 2

 

It is in the form of  a + b 2 + a - b 2 = 2 a 2 + b 2

 

= 2(40000 + 289) = 80578.