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You're on a roll — Here are the solutions to the remaining questions from the first image: QUESTION 3: A concrete mix is given as 1:2:4. If 18 buckets of sand are used, calculate the quantity of cement and aggregate needed. Step 1: Determine the value of one part in the ratio. The ratio 1:2:4 means 1 part cement, 2 parts sand, and 4 parts aggregate. Given that 2 parts of sand correspond to 18 buckets: 2 parts of sand = 18 buckets 1 part = 18 buckets2 = 9 buckets Step 2: Calculate the quantity of cement. Cement is 1 part: Cement = 1 × 9 buckets = 9 buckets Step 3: Calculate the quantity of aggregate. Aggregate is 4 parts: Aggregate = 4 × 9 buckets = 36 buckets The quantity of cement needed is 9 buckets and the quantity of aggregate needed is 36 buckets. QUESTION 4: Calculate the volume of concrete needed to construct a slab 6m long, 3m wide, and 150mm thick. Step 1: Convert all dimensions to the same unit (meters). Given: Length (L) = 6 m Width (W) = 3 m Thickness (T) = 150 mm To convert millimeters to meters, divide by 1000: T = 150 mm1000 mm/m = 0.15 m Step 2: Use the formula for the volume of a rectangular prism. The volume (V) of a slab is calculated as: V = L × W × T Step 3: Substitute the values and calculate the volume. V = 6 m × 3 m × 0.15 m V = 18 m^2 × 0.15 m V = 2.7 m^3 The volume of concrete needed is 2.7 m^3. Send me the next one 📸