A factory buys 7 machines. 2 Machine A, 2 Machine B and rest Machine C. Prices of the machines are Rs 95000, Rs 75000 and Rs 43000 respectively. Calculate the average cost of these machines?

Which of the following numbers is not a prime number?

If 7A = 5B = 2C; find A : B : C.

? – 2³ =(7² – 12 ) + ( 10² -17)

$$ {40 \%}\ of( {20\over 4}×?)=48$$

Length of rectangle is 80% of diagonal of square of area 1225, then find area of rectangle if it's perimeter is 94√2.

Ratio of speed of boat in down stream and speed of stream is 9:1, if speed of current is 3 km per  hr, then find distance travelled(in km) upstream in 5 hours.