单选题If 30% of x is 21, what is 80% of x?A28B35C42D48E56
单选题
If 30% of x is 21, what is 80% of x?
A
28
B
35
C
42
D
48
E
56
参考解析
解析:
If 30% of x is 21, then (3/10)x = 21, so (1/10)x = 1/3(21) = 7. Since (1/10)x = 7, (8/10)x, or 80% of x, is 8×7=56.
If 30% of x is 21, then (3/10)x = 21, so (1/10)x = 1/3(21) = 7. Since (1/10)x = 7, (8/10)x, or 80% of x, is 8×7=56.
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