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The Indian Space Research Organisation (ISRO) has successfully carried out the static test of the HS200 solid rocket booster, taking the space agency one more step closer to the Gaganyaan human spaceflight mission. The test was held at the Satish Dhawan Space Centre, Sriharikota. Designed and developed by the Vikram Sarabhai Space Centre (VSSC) in Thiruvananthapuram for over two years, the HS200 booster is the ‘human-rated’ version of the S200 rocket boosters used on the geosynchronous satellite launch vehicle Mk-III (GSLV Mk-III), also called the LVM3. The GSLV Mk-III rocket, which will be used for the Gaganyaan mission, will have two HS200 boosters that will supply the thrust for lift-off. The HS200 is a 20-metre-long booster with a diameter of 3.2 metres and is the world’s second largest operational booster using solid propellants.
If 'a' is the mean proportion of 12.8 and 0.8 and 'b' is the third proportional to 1.2 and 4.8, then find (a + b) :(b - a) .
In a class of 240 students, 20% decided to leave. From those who stayed, the ratio of boys to girls is 11:13. How many girls are currently in the class?
The ratio of the two numbers is 5:12. 120% of the first number is equal to the 30% of the second number. Find the sum of both the numbers.
Two numbers are in the ratio 5:3. After adding 4 and 7 to them respectively the ratio becomes 2:3. Find the bigger number.