60% of 2nd Number = 25% of 1st Number

Let 2nd number be y and 1st number be x

60y/100 = 25x/100

Therefore, y = 5x/12

Hence, 80% of y = 80y/100 = (80×5x)/(100×12) = x/3 or 33.33% of x

Ans. Average speed = 73.846 k/hr

Explanation: In 52 mins, the car covers 64 km. So, in 1 hr or 60 mins, it covers (64/52)*60 km = 73.846 km. (approx.) Thus its speed is 73.846 km/hr

Ans. The average income for the period is Rs. 4297.50

Explanation: Total income in 4 months = Rs. (4500+3550+4260+4880) = Rs. 17190 So, Rs. 17190/4 = Rs. 4297.50

See the Answer

• Area of Rectangle = Length x Breadth

• Additive Inverse means what should be added to the asked number so that the sum becomes zero.
• Therefore, the general equation is (asked number) + (inverse) = 0
• Put the values in the above equation, we get, -8 + inverse = 0
• Hence, inverse = +8

Ans There are 4 50Rs. notes and 5 10 Rs. notes.

Explanation: Let, the no. of  50 Rs. notes be x.   So, no. of 10 Rs. notes = (x+1).

Thus the total amount = Rs. [50x + 10(x+1)] = Rs. (60x + 10)

By the prob, 60 x + 10 = 240 

Solving, we get, x = 4 . So, x+1 = 5

Ans. The Sum of money is Rs. 5650

Explanation: Here, we see, interest in (6-4) = 2 years = Rs. (8362 - 7458) = Rs. 904.

So, interest in 4 years = Rs. 904 x 2 = Rs. 1808.

Hence, the sum of money = Amount in 4 years - Interest in 4 years = Rs. (7458 - 1808) = Rs. 5650.

INITIAL CONCENTRATION = 125 LITRES

REPLACED CONCENTRATION = 25 LITRES

 FINAL CONCENTRATION = INITIAL (1- REPLACED/INITIAL)^3                  [AS THIS METHOD WAS DONE FOR 3 TIMES]

                                            = 125 ( 1 - 25/125)^3

                                           = 125 ( 100/125)^3

                           ON SOLVING THIS YOU WILL GET   64 LITRES......WHICH IS MILK 

       AND REMAINING   61 LITRES WILL BE WATER . 

Hello, Anu! Please check the image for the solution. Hope it helps :)