A can do a work in 15 days and B in 9 days. If they work on it together for 5 days, then what fraction of work is left?

The value of x for which the expressions 7x + 13 and 13x - 7 become equal is _____ .

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)

$$ {40 \%}\ of( {20\over 4}×?)=48$$