If 12e=X7, where e = 12, find X.
20
15
14
12
Correct answer is A
1212=1×121+2×120=12+2=1410
| 7 | 14 |
| 7 | 2 rm 0 |
| 0 rm 2 |
∴
Evaluate 2700 000 x 0.03 ÷ 18 000
4.5 x 100
4.5 x 101
4.5 x 102
4.5 x 103
Correct answer is A
2700000 \times 0.03 \div 18000
= \frac{2700000 \times 0.03}{18000}
= \frac{81000}{18000} = 4.5 \times 10^{0}
Which of the following is in descending order?
\frac{9}{10} \frac{4}{5} \frac{3}{4} \frac{17}{20}
\frac{4}{5} \frac{9}{10} \frac{3}{4} \frac{17}{20}
\frac{9}{10} \frac{17}{20} \frac{4}{5} \frac{3}{4}
\frac{4}{5} \frac{9}{10} \frac{17}{20} \frac{3}{4}
Correct answer is C
\frac{9}{10} \frac{4}{5} \frac{3}{4} \frac{17}{20} = \frac{18, 16, 15, 17}{20}
\frac{4}{5} \frac{9}{10} \frac{3}{4} \frac{17}{20} = \frac{16, 18, 15, 17}{20}
\frac{9}{10} \frac{17}{20} \frac{4}{5} \frac{3}{4} = \frac{18, 17, 16, 15}{20}
∴ \frac{9}{10}; \frac{17}{20}; \frac{4}{5}; \frac{3}{4} is in descending order.
Find the probability that a number selected at random from 41 to 56 is a multiply of 9
\frac{1}{8}
\frac{2}{15}
\frac{3}{16}
\frac{7}{8}
Correct answer is A
Given from 41 to 56
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56
The nos multiple of 9 are: 45, 54
P(multiple of 9) = \frac{2}{16}
= \frac{1}{8}