Question
The average weight of 6 students in a group is 45 kg. If
one student is replaced by person 'B', the average weight of the group increases by 5%. Find the difference between the weight of the student who left and the weight of person 'B'.Solution
ATQ,
Total weight of the group = 45 × 6 = 270 kg
New average weight of the group = 45 × 1.05 = 47.25 kg
So, total weight of the group = 47.25 × 6 = 283.5 kg
So, difference between weights of the student who left and person 'B' =
283.5 - 270 = 13.5 kg
Alternate Solution—
Required difference = 0.05 × 45 × 6 = 13.5 kg
What will come in the place of question mark (?) in the given expression?
(63 - ?) ÷ 5 + √625 = 19 X (9 - 6)
- What will come in place of (?), in the given expression.
(4² + 6²) × 2 = ? What will come in the place of question mark (?) in the given expression?
(40/25) X 80 - ? = 45% of 300 - 5525.6% of 250 + √? = 119
1220 ÷ 61 ÷ 5 + 450 of 20% - 70 = √ ?
Simplify the expression:
(5x + 15) / (x² + 3x)
What will come in the place of question mark (?) in the given expression?Â
435 ÷ 29 X 792 ÷ 44 = √(? + 14) + 35 + 221 ÷ 17
...192.251 + 326.233 + 125.021 + 19.273 = ?
36% of 640 – 12.5% of 352 + 25% of 640 = ? – 48% of 432
Simplify the following expressions and choose the correct option.
18 * 15 - {3/5 of 250 + 72}
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