Question
The simple interest earned on investing Rs. (80X + 2000)
at simple interest of 15% p.a. for 36 months is Rs. 576 less than the total amount received on investing Rs. (64X + 300) for 90 months at simple interest of 8% p.a. What will be the interest received on investing Rs. 16000 for 2 years at simple interest of 'X%'?Solution
Simple interest earned investing Rs. (80X + 2000)= (80X + 2000) X 0.15 X (36/12) = (36X + 900) Total amount received on investing Rs. (64X + 300)= (64X + 300) + {(64X + 300) X 0.08 X (90/12) } = (64X + 300) + (38.4X + 180) = Rs. (102.4X + 480) Given that, 36X + 900 + 576 = 102.4X + 480 Or, 66.4X = 996 Or X = 996 ÷ 66.4 = 15 So, required simple interest = 16000 X 2 X 0.15 = Rs. 4800
What will come in the place of questions (?) mark in the following questions.
40, 25, 30, 50, 105, ?
- What will come in place of (?) in the given number series.
3, 9, 15, 21, ?, 33 1140, ?, 1130, 1160, 1120, 1170
55, 71, 119, 199, 311, ?
9 28 83 250 ? 2248
7   4   5   9   20    ?    160.5
84, 63, ?, 283.5, 1701
13, 41, 69, ?, 125, 153Â
120, 115, 120, 135, 160, ?
What will come in place of the question mark (?) in the following series?
555, 430, ?, -320, -1320, -3320Â
