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For example, we prove that any integer $n>1$ can be written as $w(5w+1)/2+x(5x+1)/2+y(5y+1)/2+z(5z+1)/2$ with $w,x,y,z\\in\\mathbb Z$.\n  Let $a$ and $b$ be integers with $a>0$, $b>-a$ and $\\gcd(a,b)=1$. When $2\\nmid ab$, we show that any sufficiently large integer can be written as $$\\frac{w(aw+b)}2+\\frac{x(ax+b)}2+\\frac{y(ay+b)}2+\\frac{z(az+b)}2$$ with $w,x,y,z$ nonnegative integers. 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