S can finish 50% of a work in a day. T can do 25% of the work in a day. Both of them together will finish the work in .... days.

A right-angled triangle ABC is right-angled at B, and tan A = $$\dfrac{3}{4}$$. If AC = 25 cm, the length of BC is:

If 350 marbles are shared between Sita and Savita in the ratio 5 : 9, Savita will get ............... marbles.

In a flask of volume 'V' litres, 0.2 moles of $$O_2$$. 0.4 moles of $$N_2$$ , 0.1 moles of $$NH_3$$ and 0.3 moles of $$He$$ gases are present at 27 °C. If the total pressure exerted by these non-reacting gases is 1 atm, the partial pressure exerted by $$N_2$$ gas is:

Roshan’s current age is three years less than 1.5 times that of Usha’s. 12 years ago Usha’s age was three years more than half of Roshan’s age. What is Roshan’s present age in years?