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32 + 366 ÷ 6 × 2 – 134 = 20 32 + 61 × 2 – 134 = 20 32 + 122 – 134 = 20 154 – 134 = 20 20 = 20
An alloy is made of 45% lead, 35% tin, and 20% copper. How much lead should be added to 40 kg of the alloy so that the new alloy contains 55% lead?
If 100 liters of milk solution contains 60% milk, how much milk should be added to make the solution 80% milk?
A mixture of milk and water measures 60 litres. It contains 10% water. How much water should be added to it, so that the water may be 25%?