exam Maths Puzzle Numerical Ability

Allen bought 21 stamps in 37-cent and 20-cent denominations. If the total cost of the stamps was $7.26, how many 37-cent stamps did Allen buy?

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exam Other Question

Write an equation for the line in point/slope form and slope/intercept form that passes through (1,4) and parallel to the line 2x-3y=6. can someone help me solve these??? please!!!
sqrt x-5=9 and 3 to the sqrt of x-4-2=10