Important for :

1

[17.98 ÷ 6.2] + [1.25 ÷ 0.5] – [0.96 ÷ 0.8] = ?

2

A

Let the present ages of Sitamma and Radha are x and y years respectively.We have,

10 years ago age of Sitamma was 3 times the age of Radha.

i.e. (x – 10) = 3 (y – 10)

⇒ 3y – x = 20 .............(i)

And,

10 years later age of Sitamma will be twice the age of Radha.

i.e. (x + 10) = 2 (y + 10)

⇒ x – 2y = 10 .............(ii)

Adding eqn. (i) and (ii), we get

y = 30 years

Put y = 30 years in eqn. (i), we get

⇒ 3 × 30 – x = 20

⇒ 90 – 20 = x

∴ x = 70 years

Required Ration = x : y

= 70 : 30 or, 7 : 3

Hence, option A is correct.

3

1 | 2 | + 2 | 1 | + 2 | 2 | – 4 | 1 | = ? |

3 | 3 | 3 | 2 |

4

67. 436 × 17 × 3 ÷ 32 = ?

5