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Answer :
Step 1: Assign variable for the unknown that we need to find.
Let x be the amount of cement needed.
Step 2: Set up a proportion based on the given information
Sand to Cement [tex] = 7:3 = 210:x [/tex]
Step 3: Solve the proportion to find the value of x
[tex] \frac{7}{3} =\frac{210}{x}\; [Cross\; multiplying\; on\; both\; sides]\\\\ 7\cdot x= 3\cdot 210\\ \\ 7x=630\; \; [Dividing\; by\; 7\; on\; both\; sides]\\ \\ \frac{7x}{7}=\frac{630}{7} \; [Simplifying\; the\; fraction\; on\; both\; sides]\\ \\ x=90 [/tex]
Conclusion:
90 kg of Cement is needed !
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