Explanation

Maria Salary = Rs.280

Kamran salary =?(Rs. 50 more than Maria)

Javed Salary =? (Rs. 70 less than Kamran)

**

Kamran salary = Rs. 50 more than Maria

= 280 + 50

= 280 + 50 = Rs. 330

Javed Salary = Rs. 70 less than kamran

= 330-70

= Rs. 260

***

ND18-1-2023

Explanation

A and B have invested Rs. 6000 and Rs. 8000 respectively, which means their capital ratio is:

A : B = 6000 : 8000 = 3 : 4

Since they are sharing the profits at the end of the year, it is assumed that they are sharing the profits in the ratio of their investments.

Therefore, the profit-sharing ratio should also be 3:4.

So, if the total profit is x, A should get 3x/7 and B should get 4x/7.

Explanation

Let the number of coins of each kind be x.

 5x + 2x + 1x = 1152

 8x = 1152 

x    =1152 / 8

x = 144

Explanation

Let the percentage deduction in weight be y%

y−4100−y×100=20⇒y−4100−y=15⇒5y−20=100−y⇒6y=120⇒y=20

Hence, for a meter, length used = (100 - 20)% of 1 m

= 80% of 100 cm = 80 cm