Question
150 litres of a mixture (paint + oil) contains 20% oil.
How much oil should be added to make the ratio of paint to oil 5:3?Solution
Let the quantity of oil to be mixed be ‘x’ litres
According to the question,
(0.80 × 150)/(0.20 × 150 + x) = 5/3
120/(30 + x) = 5/3
Or, 5(30 + x) = 360
Or, 150 + 5x = 360
Or, 5x = 210 ⇒ x = 42
Therefore, quantity of oil to be mixed = 42 litres
5.5 × 3.2 × 2.3 = ?
What value will come in place of (?) question mark in the given expression.
17 × 15 – 48 ÷ 4 + 9² = ?
Find the value of.
( ∛ ∛ 343 )3 × ( ∛ ∛216 )3
(3984 ÷ 24) x (5862 ÷ 40) = ?
5555 ÷ 11 ÷ 5 = 100 + ?
18 * 9 + 25% of 120 + 50% of 200 = ?
Simplify the following expressions and choose the correct option.
18² + (27 ÷ 3) × 11 − 250 = ?
What will come in the place of question mark (?) in the given expression?
(20% of 820 – 56 + 11 × 8) 1/2 = ? – 62
Simplify the following expressions and choose the correct option.
√2116 + 152 ÷ 9 - 33
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