Question
If the total cost of 4 chairs and 7 tables is Rs. 410 and
the total cost of 3 chairs and 5 tables is Rs. 300, then find the cost of 6 chairs.Solution
ATQ,
Let the cost of one chair and one table be Rs. x and Rs. y, respectively.
ATQ;
4x+7y=410(I)
3x+5y=300(II)
Multiply Equation (II) by 7 and Equation (I) by 5, then subtract:
21x+35y−20x−35y=2100−2050
x=50
Cost of 6 chairs = 6×50=300 Rs.
(31.9)3 + (34.021)² - (16.11)3 - (42.98)² = ?
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
What approximate value should come in the place of question mark in the following questions?
(598.5 ÷ 29.9) + (401.2 ÷ 20.1) = ?
(16.16 ×  34.98) + 14.15% of 549.99 = ? + 124.34
What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)...
960.02 of 238.89 ÷ 144.01 of 79.97 = ?
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
320.98 + 49.99% of (261.09 + 138.98) = ?
? = 29.91% of 49.94% of ((56.25 × 4.09 + 23.01 × 7.89) × 99.98)
20.02% of (95.96 × 104.01 – 56.02 × 64.04) – ? = 12.02 × 39.96 + 103.03Â
