Maths Quiz – Set 10
1. If (x − 3)(x + 5) = 0, what is the sum of the roots?
A. 2
B. −2
C. 8
D. −8
2. A mixture contains 40% alcohol. After adding 20 L of water, concentration becomes 25%. Find original quantity.
A. 30 L
B. 40 L
C. 50 L
D. 60 L
3. If √(5x − 5) = 10, find x.
A. 19
B. 21
C. 15
D. 10
4. What is the value of 7/8 ÷ 14/5?
A. 5/16
B. 1/4
C. 5/8
D. 1/2
5. CI on ₹2000 at 10% for 2 years?
A. ₹420
B. ₹440
C. ₹420
D. ₹462
6. If a number is increased by 20% and then decreased by 20%, net change is?
A. 0%
B. 4% decrease
C. 4% increase
D. 2% decrease
7. The LCM of 24, 32, 48 is:
A. 96
B. 144
C. 192
D. 384
8. The average of 10, 20, 30, x is 25. Find x:
A. 35
B. 40
C. 45
D. 50
9. If a worker completes 2/5 of work in 4 days, how long to finish full work?