Question
If (9x + 4y) = 808 and 2x:5y = 18:25, then find the
value of (2x² + 3y²).Solution
Given, 2x:5y = 18:25 Or, 2x × 25 = 5y × 18 Or, 50x = 90y So, x:y = 9:5 So, let the values of 'x' and 'y' be '9k' and '5k', respectively. ATQ, (9x + 4y) = 808 Or, 9 × 9k + 4 × 5k = 808 Or, 81k + 20k = 808 Or, 101k = 808 So, 'k' = 8 Therefore, values of 'x' and 'y' are 72 and 40, respectively. So, (2x² + 3y²) = (2 × 72² + 3 × 40²) = (2 × 5184 + 3 × 1600) = (10368 + 4800) = 15,168 Hence, option d.
12.5% of (100 + ?) = 40
2/9 of 5/8 of 3/25 of ? = 40
24 × √? + 4008 ÷ 24 = 40% of 200 + 327
7(1/2) – 3(5/6) = ? − 2(7/12)
280 ÷ 14 + 11 × 12 – 15 × 6 = ?
1550 ÷ 62 + 54.6 x 36 = (? x 10) + (28.5 x 40)
25% of 1000 + 10% of 150 – 22 × ? = 45
√ 729 × 5 – 220 % of 15 + ? = 120% of 160
What will come in the place of question mark (?) in the given expression?
(40% of ? × 43 ) – 232 = 751
180 % of 45 + √144 × 8 = ?2 + 80 % of 70
