Question
Which of the following statements is true about
sound? ÂSolution
Sound is a mechanical wave, so it needs a medium like air, water, or solids.  It cannot travel in vacuum (like in space).  This is why no sound can be heard in outer space.  Reflection of sound is used in SONAR and echo.
 How many 4-digit numbers can be formed from digits 1-6 if repetition not allowed and number is even?
- What is to be subtracted from (13/20) so that the result is (7/25)?
Priya had 108 chocolates of two types – dairy and dark. If she receives 36 more dairy chocolates, the ratio of dairy to dark chocolates becomes 5:4. F...
- A two-digit number '7b' is completely divisible by '4'. When the same number is divided by '3', there is a remainder of '1'. Find the value of 'b'.
Some toffees were distributed among (x + 5) students such that each student received 6 toffees. If there had been 10 students more, then toffees receive...
Three numbers are in the ratio 5:9:12. The sum of the largest and smallest of these numbers is 8500. What is the difference between the largest and smal...
Find the number of factors of 80?
Three fruit sellers P, Q and R have different quantities of fruits to sell. P and Q together have fifteen more than half of quantity what P and R togeth...
Four numbers P, Q, R, S satisfy: Q is 25% less than P, Q:R = 9:10, and R:S = 5:8. If the average of P, Q, R, S is 94, find (S – P).
How many 4-digit numbers can be formed from digits 1–9 (no repetition) such that the number is divisible by 3?
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