6th grade math help. Can someone explain step by step how to solve #1 please

87

Step-by-step explanation:

start with the innermost parenthesis first

{4+3*[5+3*(8)]-4}

order of operations: multiply before you add

{4+3*[5+24]-4}

{4+3*[29]-4}

order of operations: multiply before you subtract

{4+87-4}

solve left to right

{91-4}

87

45

Step-by-step explanation:

60 minus 15 equals 45( there is 45 girls)