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1
A and B can finish work in 12 days, B and C in 15 days, C and A in 20 days. In how many days can A, B, and C together finish it?
A.10 days
B.8 days
C.12 days
D.15 days
Explanation: 2(A+B+C) rate = 1/12+1/15+1/20 = 12/60 = 1/5. Rate = 1/10.
2
Solve: 9 × 20
A.178
B.180
C.182
D.184
Explanation: 9 × 20 = 180.
3
What is 11 + 10?
A.18
B.20
C.21
D.23
Explanation: 11 + 10 = 21.
4
Which triangle pair cannot be congruent using only two angles and a side NOT included between them?
A.ASA
B.AAS
C.SSA
D.SSS
5
The curved surface area of a hemisphere is 50.24 cm². What is its radius?
A.4 cm
B.3 cm
C.2 cm
D.5 cm
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