The sum of the age of A and B after 5 years is 90 years and the sum of the present age of B and C together is 70 years. The present age of A is 40% more than the present age of C. If the present age of D is 8 years more than that of C, then find the present age of D.

A and B started a business by investing Rs. 18000 and Rs. 22000 respectively. After 6 months, A decreased his investment by (m - 5)% and B decreased his investment by Rs. 2000. At the end of the year, the ratio of the profit share of A to B is 27: 35, then find the value of m.

In a company of 75 employees, the average weight of males is (z + 5) kg and the average weight of females is 56.25 kg and the number of females is 5 more than that of the number of males. If the average weight of all the employees in the company is 44 kg, then find the value of z.

The time taken by Train A to cross a platform of length 300 m is equal to the time taken by Train B to cross a bridge of 1000 m and the length of Train A is 70% of the length of Train B. If the speed of Train A and B is 72 km/hr and 144 km/hr, respectively, then find the length of train B.

Ram invested Rs. (3x + 160) in  scheme A at the rate of 10% per annum for compound interest and the Rs. 5x is invested in simple interest at the rate of 25% per annum for 2 years. If the interest received after 2 years in scheme A is Rs. (x - 33), then find the simple interest received by Ram.

What value should come in the place of (?) in the following questions.

(121 + 149 - 10)/10 + ?² = 16 * 18 - 37

What value should come in the place of (?) in the following questions.

?% of 880 - 4² = 1890 - 15 * 12 + 30% of 700

What value should come in the place of (?) in the following questions.

(192/24) * 12 + 25² = ?³ - 512^1/3

What value should come in the place of (?) in the following questions.

{4(1/6) + 6(3/8) - 2(1/12)} * 96 = ? - 412

What value should come in the place of (?) in the following questions.

125% of ? + (15 * 2²) = 125 + √400 * 3